Apparatus for making a halftone recording and process for making a halftone recording using the same, as well as ink tank and head cartridge fit for halftone recording and ink-jet recording apparatus using the same

Abstract

The purpose is to provide a high quality halftone recording with a reduced grainy feeling without lowering the true resolving power. Provided is an apparatus for making a halftone recording by employing three or more types of color materials, each of which has at least one grade of concentration, wherein each type of the color materials having the lowest concentration provides, when recording on a recording medium having a first lightness, a recorded region having its own lightness, and wherein a difference between the first lightness and the lightness of the recorded region is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.

What is claimed is: 
     
       1. An apparatus for making a halftone recording by employing three or more types of color materials, comprising three or more types of color materials which have respective concentrations, wherein each type of the color materials provides, when recording on a recording medium having a first lightness, a recorded region having a second lightness, and wherein a difference between the first lightness and the second lightness is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminant D65 as a light source. 
     
     
       2. The apparatus according to  claim 1 , wherein each of said color materials has at least two concentration grades which provide recorded regions having respective lightnesses, difference between the lightnesses being set within 35. 
     
     
       3. The apparatus for making a halftone recording according to  claim 1  or  2 , wherein each of the three types of color materials has at least one concentration grade and is capable of recording at a recording lightness of not lower than 60. 
     
     
       4. The apparatus for making a halftone recording according to  claim 3 , wherein all the three types of color materials record at a recording lightness of not lower than 60. 
     
     
       5. The apparatus for making a halftone recording according to  claim 1 , wherein said recording lightness is a recorded dot lightness on a recording medium. 
     
     
       6. The apparatus for making a halftone recording according to  claim 1 , wherein said recording lightness is a recording lightness at a recorded region of a 100% solid printing by said apparatus on a recording medium. 
     
     
       7. The apparatus for making a halftone recording according to  claim 1 , wherein the lightness of said recording medium ranges from 75 to 95. 
     
     
       8. The apparatus for making a halftone recording according to  claim 1 , wherein recording of said color materials is made by adherence of droplets of the color materials to said recording medium. 
     
     
       9. The apparatus for making a halftone recording according to  claim 1 , wherein the three types of color materials are color recording inks other than a black ink. 
     
     
       10. A process for making a halftone recording, comprising providing three or more color materials which have respective concentrations, and adding the color materials on a recording medium having a first lightness, wherein each type of the color materials provides, when recording on the recording medium, a recorded region having a second lightness, and wherein a difference between the first lightness and the second lightness is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminant D65 as a light source. 
     
     
       11. The process according to  claim 10 , wherein each of the color materials has at least two concentration grades which provide recorded regions having respective lightnesses, a difference between the lightnesses being set within 35. 
     
     
       12. The process according to  claim 10  or  11 , wherein one of the three types of color materials has at least one concentration grade and is capable of recording at a recording lightness of not more than 60. 
     
     
       13. The process according to  claim 12 , wherein all the three types of color materials are capable of recording at a recording lightness of not more than 60. 
     
     
       14. The process according to  claim 10 , wherein said recording lightness is a recorded dot lightness on a recording medium. 
     
     
       15. The process according to  claim 10 , wherein said recording lightness is a recording lightness at a recorded region of a 100% solid printing by an apparatus for making a halftone recording on a recording medium. 
     
     
       16. The process according to  claim 10 , wherein a lightness of said recording medium ranges from 75 to 95. 
     
     
       17. The process according to  claim 10 , wherein recording of said color materials is made by adherence of droplets of the color materials to said recording medium. 
     
     
       18. The process according to  claim 10 , wherein said three types of color materials are color recording inks other than a black ink. 
     
     
       19. An ink tank used in an apparatus for making a halftone recording, the ink tank holding three or more types of color materials which have respective concentrations, wherein each type of color materials provides, when recording on the recording medium having a first lightness, a recorded region having a second lightness, and wherein a difference between the first lightness and the second lightness is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminant D65 as a light source. 
     
     
       20. The ink tank according to  claim 19 , wherein each of the color materials has at least two concentration grades which provide recorded regions having respective lightnesses, a difference between the lightnesses being set within 35. 
     
     
       21. The ink tank according to  claim 19  or  20 , wherein one of the three types of color materials has at least one concentration grade and is capable of recording at a recording lightness of not more than 60. 
     
     
       22. The ink tank according to  claim 21 , wherein all the three types of color materials are capable of recording at a recording lightness of not more than 60. 
     
     
       23. The ink tank according to  claim 19 , wherein said recording lightness is a recorded dot lightness on a recording medium. 
     
     
       24. The ink tank according to  claim 19 , wherein said recording lightness is a recording lightness of the recorded region of a 100% solid printing by an apparatus for making a halftone recording on a recording medium. 
     
     
       25. The ink tank according to  claim 19 , wherein the lightness of said recording medium ranges from 75 to 95. 
     
     
       26. The ink tank according to  claim 19 , wherein recording of said color materials is made by adherence of droplets of the color materials to said recording medium. 
     
     
       27. The ink tank according to  claim 19 , wherein said three types of color materials are recording inks other than a black ink. 
     
     
       28. The ink tank according to  claim 19 , wherein an ID information indicating the types of color materials kept therein is so arranged as capable of being outputted. 
     
     
       29. A head cartridge that uses an ink tank according to  claim 19 , equipped with a recording head for ejecting the color materials fed from said ink tank. 
     
     
       30. A head cartridge that uses an ink tank according to  claim 19 , equipped with a recording head for ejecting the color materials fed from said ink tank and so arranged that the ID information indicating the types of color materials kept therein is outputted. 
     
     
       31. An ink-jet recording apparatus that uses a head cartridge according to  claim 30  for recording, comprising:
 a loading section for exchangeably loading said head cartridge; and 
 a printing amount control section for identifying a class of a color material kept in the loaded head cartridge with an ID information outputted by said head cartridge loaded in said loading section and deciding the driving conditions of said recording head corresponding to the identified class of the color material. 
 
     
     
       32. An ink-jet recording apparatus that uses an ink tank according to  claim 28  for recording, comprising:
 a recording head for ejecting ink kept in said ink tank; and 
 a printing amount control section for identifying the class of a color material kept therein with an ID information outputted by said ink tank and determining driving conditions of said recording head corresponding to the identified type of the color material. 
 
     
     
       33. An ink-jet recording apparatus comprising:
 a loading section for loading a first ink-jet head for ejecting a first ink of first coloristic performance and a second ink-jet head for ejecting a second ink of second coloristic performance in a mutually exchangeable manner; and   drive means for providing drive conditions to the ink-jet head loaded on said loading section.   
     
     
       34. The ink-jet recording apparatus according to  claim 33 , further comprising:
 modification means for forming a surface density with a second ink, corresponding to a coloristic surface density formed with a first ink, and modifying the drive conditions according to a ratio of the second coloristic performance with the second ink to the first coloristic performance with the first ink.   
     
     
       35. An apparatus for making a halftone recording by employing three of more types of coloring materials, wherein the three of more types of color materials have respective concentrations, each type of the color materials providing a respective recorded region having a regional lightness, a lightness difference between the regional lightnesses of the regions being not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard luminant D65 as a light source. 
     
     
       36. An apparatus for making a halftone recording by employing three types of color materials of yellow, magenta and cyan have respective concentrations, wherein each types of color materials of magenta and cyan contains color materials which provide a recorded region having a second lightness when each type of color materials of magenta and cyan is recorded on a recording medium having a first lightness, a difference between the first lightness and the second lightness being not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminant D65 as a light source. 
     
     
       37. An apparatus for making a halftone recording by employing three types of color materials of yellow, magenta and cyan which have respective concentrations, wherein the color materials provide recorded regions having respective lightnesses, a lightness difference between the recorded regions is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminant D65 as a light source. 
     
     
       38. An apparatus for making a halftone recording by employing at least two types of color materials of magenta and cyan which have respective concentrations wherein each type of the color materials provides, when recording on the recording medium having a first lightness, a recorded region having a second lightness, and wherein a difference between the first lightness and the second lightness is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminant D65 as a light source. 
     
     
       39. An apparatus for making a halftone recording by employing applying at least two types of color materials of inks, including magenta and cyan inks, from an ink applying unit on a recording medium having a first lightness, each of which the magenta and cyan inks having at least two adjacent concentration grades, one higher concentration grade and one lower concentration grades, wherein the color materials having adjacent concentration grades grade, to provide recorded regions having respective lightness lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, and a lightness difference between the recorded regions provided with the higher and lower concentration grades of the cyan ink is not more than 35, 
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35, 
 wherein an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.0, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.0, and  
 thewherein each lightness beingis measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source. 
 
     
     
       40. A process for making a halftone recording by employing three types of color materials each of which having at least two concentration grades, wherein the color materials having adjacent concentration grades provide recorded regions having respective lightness, a lightness difference between the recorded regions is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source. 
     
     
       41. A process for making a halftone recording by employing at least three types of color materials of yellow, magenta and cyan, each of which having at least one concentration grade, wherein each type of color materials of magenta and cyan contains color materials which provide a recorded region having a regional lightness when each type of color materials of magenta and cyan having the lowest concentration is recorded on a recording medium having a first lightness, a difference between the first lightness and the regional lightness of the recorded region being not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source. 
     
     
       42. A process for making a halftone recording by employing applying at least three types of color materials of inks, including yellow, magenta and cyan inks, from an ink applying unit on a recording medium having a first lightness, each of which the yellow, magenta and cyan inks having at least two higher and lower concentration grades, wherein the color materials having adjacent concentration grades to provide recorded regions having respective lightness lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the yellow ink is not more than 35, thea lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, and a lightness difference between the recorded regions provided with the higher and lower concentration grades of the cyan ink is not more than 35, 
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the yellow ink is not more than 35, a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35, 
 wherein an optical density of the recorded region provided with the higher concentration grade of the yellow ink at a 100% solid recording is not lower than 1.0, an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.0, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.0, and 
 wherein each lightness being is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source. 
 
     
     
       43. A process for making a halftone recording by employing at least two types of color materials of magenta and cyan, each of which having at least one concentration grade, wherein each type of color materials of magenta and cyan contains color material which provide a recorded region having a regional lightness when each type of color materials of magenta and cyan having the lowest concentration is recorded on a recording medium having a first lightness, a difference between the first lightness and the regional lightness of the recorded region being not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source. 
     
     
       44. A process for making a halftone recording by employing applying at least two types of color material of inks, including magenta and cyan inks, from an ink applying unit on a recording medium having a first lightness, each of which the magenta and cyan inks having at least two adjacent concentration grades, wherein the color material having adjacent concentration grades one higher concentration grade and the one lower concentration grade, to provide recorded regions having respective lightness lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, theand a lightness ofdifference between the recorded regionregions provided with the higher and lower concentration grades of the cyan ink is not more than 35, the 
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35, 
 wherein an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.0, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.0, and 
 wherein each lightness being is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source. 
 
     
     
       45. The process apparatus according to any of  claims 40 ,  42  and  44 , claim 39,wherein the color material of the highest concentration attain an the optical density of the recorded region provided with the higher concentration grade of the magenta ink at the 100% solid recording is not lower than 1.0 at a 100% solid printing 1.4, and the optical density of the recorded region provided with the higher concentration grade of the cyan ink at the 100% solid recording is not lower than 1.4. 
     
     
       46. The process according to any of  claims 40 ,  42  and claim  44 , wherein the color material of the highest concentration attain an the optical density of the recorded region provided with the higher concentration grade of the magenta ink at the 100% solid recording is not lower than 1.4 at a 100% solid printing, and the optical density of the recorded region provided with the higher concentration grade of the cyan ink at the 100% solid recording is not lower than 1.4. 
     
     
       47. The process according to any of  claims 40 , claim  42  and or  44 , wherein at least either one of the printing amount of the color material an ink or the maximum printing amount onto a recording medium is modified according to the concentration of a color material the ink. 
     
     
       48. A process for making an image, comprising the steps of:
 providing at least three types of color materials of inks, including yellow, magenta and cyan inks, each of which having has at least two concentration grades; and 
 forming an image on a recording medium by employing applying the color materials inks, the image consisting of primary colors made by each of the color materials inks, and secondary colors made by mixture of the different types of color materials inks, 
 wherein the color materials inks having adjacent concentration grades provide recorded regions having respective lightness, a lightness difference between the recorded regions is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source, and wherein the forming step comprises
 a step of subjecting to color separation of each of pixels constituting the image into primary color components, and 
 a step of modifying maximum printing amounts of the color materials inks being added onto the recording medium according to the concentration grades of the color materials inks as for the primary color components resulting from the color-separation. 
 
 
     
     
       49. The apparatus according to claim 45, wherein the ink applying unit is configured to apply a yellow ink having only one concentration grade to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.4.    
     
     
       50. The apparatus according to claim 49, wherein the magenta ink has only the two concentration grades, and the cyan ink has only the two concentration grades.  
     
     
       51. The apparatus according to claim 45, wherein the ink applying unit comprises an inkjet head.  
     
     
       52. The apparatus according to claim 39, wherein the ink applying unit is configured to apply a yellow ink having only one concentration grade to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.0.    
     
     
       53. The apparatus according to claim 52, wherein the magenta ink has only the two concentration grades, and the cyan ink has only the two concentration grades.  
     
     
       54. The apparatus according to claim 52, wherein the ink applying unit comprises an inkjet head.  
     
     
       55. The apparatus according to claim 39, wherein the ink applying unit comprises an inkjet head.  
     
     
       56. The process according to claim 46, further comprising a step of applying a yellow ink having only one concentration grade from the ink applying unit to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.4.    
     
     
       57. The process according to claim 56, wherein the magenta ink has only the two concentration grades, and the cyan ink has only the two concentration grades.  
     
     
       58. The process according to claim 56, wherein the ink applying unit comprises an inkjet head.  
     
     
       59. The process according to claim 44, further comprising a step of applying a yellow ink having only one concentration grade from the ink applying unit to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.0.    
     
     
       60. The process according to claim 59, wherein the magenta ink has only the two concentration grades, and the cyan ink has only the two concentration grades.  
     
     
       61. The process according to claim 59, wherein the ink applying unit comprises an inkjet head.  
     
     
       62. The process according to claim 44, wherein the ink applying unit comprises an inkjet head.  
     
     
       63. An inkjet recording apparatus for making a halftone recording by applying at least two types of inks, including magenta ink and cyan ink, from an ink applying unit on a recording medium having a first lightness, each of the magenta and cyan inks having only two concentration grades, one higher concentration grade and one lower concentration grade, to provide recorded regions having respective lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, and a lightness difference between the recorded regions provided with the higher and lower concentration grades of the cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35,   wherein an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.4, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       64. The apparatus according to claim 63, wherein the ink applying unit is configured to apply a yellow ink having only one concentration grade to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.4.    
     
     
       65. An inkjet recording apparatus for making a halftone recording by applying at least two types of inks, including magenta and cyan inks, from an ink applying unit on a recording medium with an ink receiving layer formed thereon having a first lightness, each of the magenta and cyan inks having only two concentration grades, one higher concentration grade and one lower concentration grade, to provide recorded regions having respective lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, and a lightness difference between the recorded regions provided with the higher and lower concentration grades of the cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35,   wherein an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.4, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       66. The apparatus according to claim 65, wherein the ink applying unit is configured to apply a yellow ink having only one concentration grade to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.4.    
     
     
       67. An inkjet recording process for making a halftone recording by applying at least two types of inks, including magenta and cyan inks, from an ink applying unit on a recording medium having a first lightness, each of the magenta and cyan inks having only two concentration grades, one higher concentration grade and one lower concentration grade, to provide recorded regions having respective lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, and a lightness difference between the recorded regions provided with the higher and lower concentration grades of the cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35,   wherein an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.4, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       68. The process according to claim 67, further comprising a step of applying a yellow ink having only one concentration grade from the ink applying unit to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.4.    
     
     
       69. An inkjet recording process for making a halftone recording by applying at least two types of inks, including magenta and cyan inks, from an ink applying unit on a recording medium with an ink receiving layer formed thereon having a first lightness, each of the magenta and cyan inks having only two concentration grades, one higher concentration grade and one lower concentration grade, to provide recorded regions having respective lightnesses on the recording medium,
 wherein a lightness difference between the recorded regions provided with the higher and lower concentration grades of the magenta ink is not more than 35, and a lightness difference between the recorded regions provided with the higher and lower concentration grades of the cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided with the lower concentration grade of the cyan ink is not more than 35,   wherein an optical density of the recorded region provided with the higher concentration grade of the magenta ink at a 100% solid recording is not lower than 1.4, and an optical density of the recorded region provided with the higher concentration grade of the cyan ink at a 100% solid recording is not lower than 1.4, and   wherein lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       70. The process according to claim 69, further comprising a step of applying a yellow ink having only one concentration grade from the ink applying unit to provide a recorded region on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and the recorded region provided with the yellow ink is not more than 35, and   wherein an optical density of the recorded region provided with the yellow ink at a 100% solid recording is not lower than 1.4.    
     
     
       71. An inkjet recording apparatus for performing a halftone recording by ejecting at least a first magenta ink, a second magenta ink having a color material concentration higher than that of the first magenta ink, a first cyan ink, and a second cyan ink having a color material concentration higher than that of the first cyan ink from an ink ejecting device on a recording medium having a first lightness,
 wherein a lightness difference between a recorded region provided by the first magenta ink and a recorded region provided by the second magenta ink is not more than 35, and a lightness difference between a recorded region provided by the first cyan ink and a recorded region provided by the second cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided by the first magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided by the first cyan ink is not more than 35,   wherein a maximum optical density of a recorded region provided by the second magenta ink is not lower than 1.4, and a maximum optical density of a recorded region provided by the second cyan ink is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       72. The inkjet recording apparatus according to claim 71, wherein the ink ejecting device is configured to eject a yellow ink on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and a recorded region provided by the yellow ink is not more than 35, and   wherein a maximum optical density of a recorded region provided by the yellow ink is not lower than 1.4.    
     
     
       73. An inkjet recording apparatus for performing a halftone recording by ejecting at least a first magenta ink, a second magenta ink having a color material concentration higher than that of the first magenta ink, a first cyan ink, and a second cyan ink having a color material concentration higher than that of the first cyan ink from an ink ejecting device on a recording medium with an ink receiving layer formed thereon having a first lightness,
 wherein a lightness difference between a recorded region provided by the first magenta ink and a recorded region provided by the second magenta ink is not more than 35, and a lightness difference between a recorded region provided by the first cyan ink and a recorded region provided by the second cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided by the first magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided by the first cyan ink is not more than 35,   wherein a maximum optical density of a recorded region provided by the second magenta ink is not lower than 1.4, and a maximum optical density of a recorded region provided by the second cyan ink is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       74. The inkjet recording apparatus according to claim 73, wherein the ink ejecting device is configured to eject a yellow ink on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and a recorded region provided by the yellow ink is not more than 35, and   wherein a maximum optical density of a recorded region provided by the yellow ink is not lower than 1.4.    
     
     
       75. An inkjet recording process for performing a halftone recording by ejecting at least a first magenta ink, a second magenta ink having a color material concentration higher than that of the first magenta ink, a first cyan ink, and a second cyan ink having a color material concentration higher than that of the first cyan ink from an ink ejecting device on a recording medium having a first lightness,
 wherein a lightness difference between a recorded region provided by the first magenta ink and a recorded region provided by the second magenta ink is not more than 35, and a lightness difference between a recorded region provided by the first cyan ink and a recorded region provided by the second cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided by the first magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided by the first cyan ink is not more than 35,   wherein a maximum optical density of a recorded region provided by the second magenta ink is not lower than 1.4, and a maximum optical density of a recorded region provided by the second cyan ink is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       76. The inkjet recording process according to claim 75, further comprising a step of ejecting a yellow ink from the ink ejecting device on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and a recorded region provided by the yellow ink is not more than 35, and   wherein a maximum optical density of a recorded region provided by the yellow ink is not lower than 1.4.    
     
     
       77. An inkjet recording process for performing a halftone recording by ejecting at least a first magenta ink, a second magenta ink having a color material concentration higher than that of the first magenta ink, a first cyan ink, and a second cyan ink having a color material concentration higher than that of the first cyan ink from an ink ejecting device on a recording medium with an ink receiving layer formed thereon having a first lightness,
 wherein a lightness difference between a recorded region provided by the first magenta ink and a recorded region provided by the second magenta ink is not more than 35, and a lightness difference between a recorded region provided by the first cyan ink and a recorded region provided by the second cyan ink is not more than 35,   wherein a lightness difference between the recording medium having the first lightness and the recorded region provided by the first magenta ink is not more than 35, and a lightness difference between the recording medium having the first lightness and the recorded region provided by the first cyan ink is not more than 35,   wherein a maximum optical density of a recorded region provided by the second magenta ink is not lower than 1.4, and a maximum optical density of a recorded region provided by the second cyan ink is not lower than 1.4, and   wherein each lightness is measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.    
     
     
       78. The inkjet recording process according to claim 77, further comprising a step of ejecting a yellow ink from the ink ejecting device on the recording medium,
 wherein a lightness difference between the recording medium having the first lightness and a recorded region provided by the yellow ink is not more than 35, and   wherein a maximum optical density of a recorded region provided by the yellow ink is not lower than 1.4.