Color after image demonstration - Seeing color when there is none. [Of Two Minds]

I'm teaching about opponent processes in color vision today and thought I'd share one of my favorite examples. This is how you use the human visual system to turn a black and white photo into color. Try it out:

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I'm teaching about opponent processes in color vision today and thought I'd share one of my favorite examples. This is how you use the human visual system to turn a black and white photo into color. Try it out:
All of you are probably familiar with color opponency, but just in case, I'll give you a quick refresher. I'll even start with the history. In the 19th century, there were two competing theories of color vision. The first was the Young-Helmholtz theory (sometimes called the trichromatic theory),…
This is a guest post by Suzie Eckl, one of Greta's top student writers for Spring 2007 Forget color television. Before we had color, we had black and white. Before we had movies, we had photographs. And before photographs we had... Engravings? Prior to August 19, 1839, the date Daguerre and…
So how does Superman do it! He can see through buildings and clothing (he checks out Lois Lane's underwear in Superman 1 - more on this later). Many have attempted to answer this question of the ages yet few have explored this in as much depth as J.B. Pittenger who published a study in the…