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Topic:
Optical Illusion sheds some light on projection screen colors
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Post 1 made on Tuesday March 28, 2017 at 17:03
Ernie Gilman
Yes, That Ernie!
Joined:
Posts:
December 2001
30,104
Ever notice that gray screens somehow appear to be white when a picture is projected onto them? Ever notice that you can see actual black areas on a screen that has some incident light falling on it? Well, the color and brightness of a projection screen when the projector is off is the darkest the screen will ever be, so it is said that this brightness level is the black that people will see when you then turn on a projector.

It ain't so.

I've noticed and tested for myself that parts of an image that are supposed to be black look darker than the screen did when not illuminated. This is especially obvious in the occasional setup where a white painted wall is used as the screen -- black inside the picture is darker than the area around the screen.

I just ran across an optical illusion that ilustrates this nicely. It's at [Link: mydailyviral.com] where there are several other interesting illusions.

The gray bar is one color and does not change colors:








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A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 2 made on Tuesday March 28, 2017 at 18:06
SWFLMike
Long Time Member
Joined:
Posts:
January 2007
354
Very cool! I've often wondered about that stuff. Thanks for posting that!

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