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Interesting illusion

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Interesting illusion Jim Clark 31 Oct 16:53
Interesting illusion Giles Ellis 01 Nov 16:33
Interesting illusion Kevin Myers 01 Nov 16:42
Jim Clark
2002-10-31 16:53:03 UTC (almost 18 years ago)

Interesting illusion

Thought you might enjoy this--very amusing! The illusion is a checkerboard with a white and black square being the same color because of a shadow.

http://www.sunbelt-software.com/stu/fooled.jpg

Giles Ellis
2002-11-01 16:33:04 UTC (almost 18 years ago)

Interesting illusion

Jim Clark wrote:

Thought you might enjoy this--very amusing! The illusion is a checkerboard with a white and black square being the same color because of a shadow.

http://www.sunbelt-software.com/stu/fooled.jpg

Kevin Myers
2002-11-01 16:42:52 UTC (almost 18 years ago)

Interesting illusion

I also really appreciated that "illusion" image. Not only is it a cool illustration, but it also happens to fit right in to a project that I'm presently working on, which involves distinguishing black and white portions of scanned images that have varying contrast and brightness due to folds, stains, reproduction anomalies, etc. I'm essentially working on a more sophisticated than average adaptive contrast and brightness adjustment / thresholding application. The subject image will provide an excellent test target for my gimp plug-in.

By the way, I also agree: Wow, those colors sure seem different to the eye! Really hard to believe they are the same.

s/KAM

----- Original Message ----- From: "Giles Ellis"
To: "Jim Clark"
Cc:
Sent: Friday, November 01, 2002 9:33 AM Subject: Re: [Gimp-user] Interesting illusion

Jim Clark wrote:

Thought you might enjoy this--very amusing! The illusion is a

checkerboard

with a white and black square being the same color because of a shadow.

http://www.sunbelt-software.com/stu/fooled.jpg