Hi all,
I just found out linear dodge and burn can be a quick way to check for colors when printed on a color paper or projected on a color canvas (for those who still know about slide-projectors):
To proof colored paper (CMYK) create a layer, fill with the paper color and move your image on top. Then set the blending mode of the image to linear burn.
To proof colored canvas (RGB) create a layer, fill with the canvas color and move your image on top. Then set the blending mode of the image to linear dodge.
Thought I'd post this since I was thinking about it and just couldn't imagine how to do it