In order to check the perception of color choices, I'd like to be able to simulate color blindness for people with normal eyesight (me, basically).

My goal is to weaken / worsen / decrease the contrast in order to get a feeling how bad something (an advertisement, UI design etc.) is for a person with color vision deficiencies.

It should consider typical color blindness types that are medically accepted, like red-green blindness, blue weakness, blue blindness and monochromacy.

It's basically the opposite of what is requested in Screen filter for colorblind, where the goal is to improve the contrast for colorblind people.

Please suggest a gratis offline tool for Windows.

I do not need:

• a pure contrast analyzer like CCA