Thanks for the quick response! I'll give that a try.
I'm using convert 6.7.8-9 Q16 on linux.
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First, I'm not sure if a 'mask' is the correct operation. Here's what I'm trying to do. + I have 2 images. Image1 is color, Image2 is greyscale. + The greyscale image has pixel values from 0-255 Using the x,y pixel value of greyscale Image2, I want to darken (or lighten) the same x,y pixel value of ...