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| 17 AUG 2006 at 12:36pm |
CarolineJA+ Overseer
Posts : 16540
Joined: 28 JAN 2007
Location: AU
Status : Offline | That is so nifty. How do they discover tricks like this? It's amazing, moving the eyes or blinking seems to 'refresh' the image to B&W and update the brain's info. Cool.
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| 18 AUG 2006 at 4:40pm |
Banjo CousinIntergalactic Janitor
Posts : 6
Joined: 12 JUL 2006
Status : Online | It's based on the well known complementary color afterimage illusion. The idea is to make the colors complementary colors of medium brightness so that the afterimage only adds the colors to the B&W picture and not affect brightness.
I tried to make one in Photoshop some time ago but it didn't look right. This time I made a program with color management and CIECAM02 color model to calculate the luminance (B&W) and inverse color pictures.
http://bitsu.earth.prohosting.com/inverse_color.htm
I converted the original AdobeRGB(199 picture to sRGB in Photoshop. Then I convert RGB -> XYZ -> JCh, set C=0 (remove color) and convert back to RGB to get the luminance picture. For inverse color I set J=50 (half brightness), C=C*1.75 (75% more saturation), h=h+180 (inverse color). I'm not sure it's the right way but it looks better than what I did with Photoshop.
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| 18 AUG 2006 at 8:34pm |
JenniferMillerSorcerer Apprentice
Posts : 232
Joined: 16 OCT 2002
Status : Online | ACK!
That's brilliant - I love it!
(Ways to kill a Friday afternoon, waiting for 5pm to come around.)
Jennifer 8-)
I am Sirrus. AND I WILL NOT BE DEFEATED!!!&&&&Visit me on MySpace!&&[url]http://www.myspace.com/BonoGirl79[/url]
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| 18 AUG 2006 at 10:44pm |
Lady KestrelGuild Master
Posts : 4038
Joined: 27 SEP 2004
Location: US, NJ
Status : Offline | That's neat! I remember doing something similar in the section on color in the World Book Encyclopedia when I was a kid. Staring at a reverse color portrait of Abe Lincoln and then looking at a white paper made the true colors appear.
"Where is the fountain that throws up these flowers in a ceaseless outbreak of ecstasy?"
-Rabindranath Tagore
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| 19 AUG 2006 at 3:42am |
SkyeSorcerer Apprentice
Posts : 348
Joined: 20 OCT 2002
Status : Online | That has to be the neatest thing I have ever seen [smiley=cool.gif]
Can't wait to show my husband.
Indie Developer of Scavenger Hunter&&The Replayable Adventure Game!&&- 4,446 scenes, 5,796 overlays,&&- First Indie Adventure Game&& To Use A.I. Randomizer Technology,&&- 7 years in the making!!! RELEASED !!!&&&&Order yours now at:&&[url]http://www.Sagewood-Software.ca[/url]
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