Making The Color Picker Show CMYK
If you’re working in CMYK mode and you go to the Color Picker, it still displays RGB colors. This is a bit of a problem, because you think you’re picking one color, but when you start to paint or fill with that color, you get the CMYK desaturated version. Here’s a tip to get around that. When you’re in CMYK mode and you go to the Color Picker, press Command-Y (PC: Control-Y), which is the shortcut for Proof Colors (found under the View menu). When you do this with the Color Picker open, it changes all the colors in the Color Picker to CMYK colors. That way, when you pick a color in the Color Picker, it looks the same when you paint or fill with it in your CMYK image.