Method for preventing selected pixels in a background image from showing through corresponding pixels in a transparency layer

Abstract

The present invention converts an image into a transparency, or “foreground image layer”, on which the readability of text and other detail is preserved after compositing with a background, while maintaining color information of broad areas of the image. In an embodiment, a matte is determined for the background image to reduce transparencies in the foreground layer, so as to prevent irrelevant parts of the background image from showing through. This is in distinction to only using the original foreground image data (prior to its transformation to a layer) to compute a matte (or mask, or alpha channel) to form a foreground layer.

I claim: 
     
         1 . A method for reducing of transparency in the foreground layer comprising:
 a) determining a matte for a presenter's image, forming a presenter's layer,   b) determining a matte for a presentation material image, forming a presentation layer,   c) compositing the presenter's layer over the presentation material image,   d) compositing the presentation layer over the composited presenter's layer and presentation material image.