Colour AfterImages

Select the Show test image button.

Take a good look at the test image of white with a black cross in the middle, fixating on the central cross.

Check that it looks white

Then press Show colour image and stare at the coloured image, again fixating on the central black cross for at least one minute (eg count to 60 slowly).

Then press Show test image, and look back at the test image.

Read explanation.