I have a table that I am using colors to highlight certain cells containing the repeated values. Cells with values that do not repeat are uncoloured.
Because of illusionary effects, the cells that are not coloured look "off white" or even a pale cream, or light blue.
You can spot that they are actually white if you use a sheet of paper to cover the coloured cells around them.
Below is the same table again, I have marked the cells that are infact white with a red X
How can I stop this colour illusion?
I suspect that actively colouring the white backgrounded cells a grey could work.
This is primarily for viewing on Monitors, but it may also be printed.