Science Forums 2

[cwes99_03]

I visited the site. The matter is that the light being transmitted through the mask is fundamentally different due to the filter. Thus until you move the filter the light being transmitted is actually a different wavelength. Thus it is not just some perception as your initial post suggested.
I can't copy and test the flash based example to test whether or not they are physically changing the colors, but I would just about garauntee they are. If you could get unedited video in which the same basic effect is occuring then you would have nothing more than the first part of this post. It is not a matter of how your brain perceives the color because of surrounding colors, but a matter of what wavelength is being transmitted through the filter.