Ok, so say you’re trying to sell a print(picture 1), but 4% of your customers don’t want it because it’s heavy in red and green. To them, it all looks the color of nasty yellow sewer water because they are color blind(picture 2). You can make a version of that print that appeals to colorblind people pretty easily by using photoshop’s colorblindness tools!
All you have to do to see your image as someone with colorblindness would is go into the view menu and select proof setup> colorblindness and then you can select between duetronopia and protanopia. Unfortunately, tritanopia is currently unsupported. Once you see the colorblind version you can adjust it to better portray your art to colorblind users. For instance, after scrolling through the options in hue and saturation, I came to the conclusion that blue with yellow highlights and an increase in contrast (picture 4) best portrayed the feel of my work within the protanope-visible color range.These adjustments took under 5 minutes.
If I simply saved it, because it’s a proof and not a proper filter, it would end up looking like the fourth image, which is displaying just the adjustments and not the filter they are meant to be seen through. I don’t really like that version and I don’t want anyone seeing it, so what I have to do to save a JPG of image three is save the color shifted version as a pdf with the proof embedded, then open it up in acrobat and save it as a jpg from there.
It’s a little roundabout, but as far as I know there isn’t a better way to save color blind versions of work while retaining the control over the size of the work that photoshop provides. If you have a better way please let me know!