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You can upload screenshots to this free service:

http://www.vischeck.com/vischeck/vischeckImage.php

Photoshop has actually implemented this since CS4 (http://www.colblindor.com/2009/01/04/photoshop-cs4-accessibi...). I would imagine that it's probably in other parts of creative suite as well.

There is a java app called Color Oracle that works on all platforms (http://colororacle.cartography.ch/). Turn it on and choose which color blindness to simulate.

I'm color blind and when switching to protanopia, the colors on my screen don't actually change for me.

My brother has developed an app that does this:

http://ilabs.microsoft.com/Project/Pages/Project.aspx?Projec...