just thought of a simple way to use another image as a color reference and have it accessible to the color-picker:
make a simple Zscript that does nothing but load the reference image into the script area
e.g. a script “ref_image.txt” might contain the single line:
[image,some_image.psd,0,800]
(an explanation of the parameters to the “image” command can be found at:
http://pixologic.com/home/z2coderef.html )
“some_image.psd” would be located in the same directory as “ref_image.txt”
of course you might want to rearrange the reference image beforehand so that it’s a long horizontal strip