P3D Re: Interesting visual phenomenon discovered.

[jacob@xxxxxxxxxxxxxx (Gabriel Jacob)]

Greg W. writes:
>Simply by coincidence, after viewing the anaglyph for maybe 10-15
>seconds, I closed one of my eyes, and to my great surprise noticed a
>VERY obvious tint to the once-white screen.  I was amazed to discover
>that just 10-15 seconds with these glasses over my eyes caused a very
>distinct "after-image" of the complimentary color!  I.e. my left eye
>which had been looking through the red lens now had an obvious cyan
>color shift, and my right eye a red shift.

Yeap, many people have discovered this phenomenon, especially when
working and viewing anaglyphs for hours on end. This is what I 
mentioned in Photo-3D #1515.

Dr. George A. Themelis writes

>>Someone mentioned the possiblity of viewing anaglyph WITHOUT glasses
>>utilizing this effect. I'll have to try it.

Gabriel replies:
>Don't bother. I have tried it once when I was looking at anaglyphs
>on the web for hours and when I took of the glasses, one eye was
>seeing everything in red and the other in green. It dawned on me to
>try looking at the anaglyphs without the glasses but when I tried it
>I didn't see 3D. Anyways maybe it was me and somebody else can see
>it. Good Luck.

As you mention you see the complementary color. This is quite like
the seeing afterimages. There is a classic example where the red,
white and blue (US star and stripes) flag is painted turquoise,
black and yellow. Staring at this strange colored flag for a few
seconds and then staring at a white wall will result in seeing the
flag in it's true colors! The trick is to stare on exactly one fixed
point on the flag or it won't be as effective. This is because you
have to "tire out" the cones in your eyes. There are other numerous
examples and probably quite a few on the net or you can make your
own.

P.S. If you want to discover some other freaky effects, try humming
a few bars to see them literally on your monitor! If you don't have
a good singing voice ;-), try eating some crunchy chips or hard
candy and look at your monitor. 

Gabriel 


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