Colour blindness

From ITCH

see Fatbits It has a colour element

When checked, Fatbits modifies the colors it displays for those with color vision deficiency. There are three controls: Red-green brightness - for those with Anomalous Trichromacy. Moving the slider to "high" increases the contrast between red and green. Double-click the slider to return it to its default position. Show as blue - for those with Protanopia or Deuteranopia. Moving the slider to "red" (for protanopes) transfers red colors to blue. Moving the slider to "green" (for deuteranopes) transfers green colors to blue. Double-click the slider to return it to its default position. Contrast - increases the luminance contrast when moved to "high", and inverts the luminance when moved to "reverse". Double-click the slider to return it to its default position.