Talk:Color constancy

From the article:

early morning daylight, whose main component is bluish, and also in the late afternoon light, when the main component is reddish.

You sure about that? The color of sunlight on Earth's surface depends on the amount of atmosphere it's passing through, ie the angle of elevation of the Sun above the horizon. Early morning and late afternoon should look the same.

Perhaps the author of that passage doesn't get up early enough to be aware of the sunrise phenomenon. :) Or else is referring to pre-dawn light, which will lack direct sunlight and be deflected (bluish) light from the atmosphere... same as dusk. --Brion

"The effect was discovered in 1971 by Edwin Land."

(The inventor of the Polaroid ?)

I seriously wonder if he discovered it. He may have theorized it. But every photographer knew it before. If you take photo in artificial light with a daylight slide film the picture is very orange.

Ericd 01:17 Apr 7, 2003 (UTC)

At second thought this as a lot of connection with photography aren't retinex algorithms an automatic white balance algorithms ? Ericd 01:22 Apr 7, 2003 (UTC)