Rodney Blackall wrote:

It is amazing how many Powerpoint users don't appreciate that there may be
a difference between their perfect colour vision view of a high
resolution monitor, and average eyes on a projected image. Silly
phantasies like yellow text on a cyan background, or bright red on bright
blue ought to bring punishments that only The Mikado could devise in his
object to make the punishment fit the crime.

Best colours are probably yellow on a dark blue background. Black on
white is good (excellent contrast) but the contrast is perhaps a little
bit too high for some people. Yellow-blue is slightly less contrasting.

Red-blue is bad because the eye needs to focus red and blue light
slightly differently. Hence the reason why the text seems to hover over
the background.

It's amazing how many people make these mistakes - I'm a member of a
'visualisation' (drawing stuff with computers) research group and even
the members of the group make these mistakes sometimes!

Jonathan
Canterbury