On 1/8/2010 5:43 AM, Vincent Le Chevalier wrote:

> Through the red lens, light coming from the cyan parts is filtered out,
> therefore the cyan parts are visible in black. Light coming from the red
> parts and light coming from the white parts should in theory end up at
> exactly the same color, thus you can't distinguish the red parts when
> you look through the red lens.

That is the theory, at least, but there are also a couple factors to 
consider: The filters ( if it's and LCD screen ) or phosphors ( if it's 
a CRT screen) May not exactly match the red of  the glasses. The glasses 
themselves may allow a certain amount of green or even blue to pass. I 
think you're spot on in using a dimmer gray background:

What you may want to do as an experiment is set up an image where you 
have a red line (and what the heck! A cyan line, too!) and tweak the 
background color until the red line blends completely with the white 
background (the do the same with Cyan, eventually you will need to make 
some sort of compromise between to do. Then you have what you will need 
to balance out the anaglyph and get the ideal filtration.

-- 
~Mike

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