2009/3/18 Brian Becker <bbecker at jaeb.org>: > I have been tasked with finding a way to change the color mappings on a > CentOS 5.2 system. Basically I want to make an image that is black and > white appear in different shades of gray by adjusting the color mappings. I > need to know the starting point for the color maps however so I can make the > appropriate adjustments. I have been told this should be some kind of look > up table array of 256x3 elements. I have searched through the frame buffer > in the kernel and the driver area for the intel frame buffer but haven't > found anything that looks appropriate. Does this table exist or is the > problem being tackled completely wrong. Sounds like you're approaching it incorrectly. I had to do a similar thing for a class I took some years ago. The goal was to make a viewer for a fax TIFF image. The approach I used was to break the b/w image into 4x4 or 8x8 blocks, then count the number of dark pixels and based on that, assign that to a grayscale level. It worked, but was quite slow. ImageMagick has some utilities that do similar things.