Colour Blindness

The following pictures show my colour wheel, in its original form, and after adjustment to simulate protanopic (red deficient) and deuteranopic (green deficient) red/green colour-blindness. The images were processed using VisCheck.
Normal vision (92% of men) Protanopia (1% of men) Deuteranopia (5% of men)

The protanopic version shows the colours I see thus the first two images look identical to me. The third image is the most common form of red/green colour-blindness. (Most people find the second and third images very similar, but they are quite different to me).


These are on separate pages, to reduce colour distractions. Note that the simulations do not address the philosophical questions of subjective experience, but they do demonstrate a striking reduction in the colour space without affecting the image as I see it. It is of course possible that the colour space could be reduced further, or to a different subset, with equivalent results.
  1. Photo of me.
  2. Vermeer painting.
  3. Wildlife.
  4. Landscape.


Kevin Cowtan:

Keywords: color, colorblind, colourblind.