any update on this? i really hope this can be done using CHDK. my gf has an lx3 and i really like its dynamic b&w. i would really love to have that in my g7 also.
There's nothing to update. With the tools currently available to CHDK, it's a bad idea and it's not likely to happen in the foreseeable future. Until someone reverse engineers the DSP side of digic (progress so far: 0%), image processing belongs on the PC, not on the camera.CHDK at the moment can only modify the raw buffer (before it is turned into a jpeg), it can't alter the jpeg process, or the jpeg after it has been created. The camera jpeg develop process (again, presumably with the help of the DSP stuff that is a magic black box to us) is designed to produce a color image. One could probably figure out how to modify the raw buffer to get the camera to produce a mostly black and white jpeg, but it's likely the quality would be less then you would get from converting a normal jpeg to B&W on your PC, and certainly less than you could get from doing the same to a RAW. Since processing on the ARM CPU is quite slow, doing B&W this way would probably not be a lot quicker than saving the RAW.Bizarrely, the "My colors" option on my a540 offers sepia but not plain B&W. Color accent does a passable B&W if you select a gray as the color. Now that I think about it, tracking down the code that handles these options might be a place to start for someone is interested in hacking the colors of jpeg output.
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