Hello again i tryed it but i don't find mycolors setting where it is it is in chdk menu? Thanks for the responce
my colors is a canon firmware feature, see your canon manual. Using msl's suggestion, you could shoot raw, and then try different my colors effects after the fact using CHDK raw develop.
CHDK generally does not modify the image colors. There was a curves feature for 10 bit cameras but it has never been updated to support 12 bit, so it doesn't work on most cameras current cameras.
Using CHDK 1.4 you can read and write raw data from script, but processing the entire image would be extremely slow.
In general, shooting raw and doing these kind of effects in image processing software later is likely to be a better approach.