I suspect Prof_Pixel means that to make your eye see a colour-cast, even where there is none, is relatively easy when there are different light-sources around. As an example, the lightbox might be a perfect daylight temperature, but if everything else in the room is bright but warmer, then the slides can easily appear blue. However, when the slide is the only light around (projection in the dark, for example) then the eye does it's adaptation thing quite nicely.
Last edited by MartinP; 06-29-2013 at 06:38 PM. Click to view previous post history.
Reason: copy-paste error