[ale] OT: Optical Illusion.

[Lightner, Jeff]

Nice.  You don't even have to put it into GIMP or Photoshop to see the colors are the same since they explain it is the ping and orange stripes that cause the illusion.

Take some opaque straight edges and put it on the pink stripe on either side of one of the blue bands and you'll see it actually appears to turn color to be the nearly the same as one of the green bands.   (I used the edge of a post-it note pad and a stack of business cards for my two straight edges.)





-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Byron Jeff
Sent: Friday, September 16, 2011 9:43 AM
To: Atlanta Linux Enthusiasts
Subject: Re: [ale] OT: Optical Illusion.

On Thu, Sep 15, 2011 at 11:55:04PM -0400, David Tomaschik wrote:
> On 09/15/2011 11:46 PM, Michael H. Warfield wrote:
> > Someone at the meeting tonight asked me to post the URL to the colored
> > spiral optical illusion I had with me.  Here it is:
> >
> > http://topcultured.com/an-illusion-so-impossible-i-had-to-double-check-in-photoshop/
> >
> > The blue and the green strips in the image are actually the exact same
> > color.  June wouldn't believe it so I used gimp to create two squares on
> > a white background in another image and used the dropper tool to fill a
> > square from the blue and a square from the green (hint - start with the
> > blue) and they were both identical.  It's even more astonishing printed
> > on paper where the contrast is higher and the blue seems darker.
> >
> > Mike
> >
> That link is broken.  "Sorry for the delay but TopCultured is getting a
> much needed overhaul. Come back soon!"

Google. cache:

http://webcache.googleusercontent.com/search?q=cache:rOHE3VxIbuoJ:topcultured.com/an-illusion-so-impossible-i-had-to-double-check-in-photoshop/+an-illusion-so-impossible-i-had-to-double-check-in-photoshop/&cd=1&hl=en&ct=clnk&gl=us

>
> --
> David Tomaschik, RHCE, LPIC-1
> System Administrator/Open Source Advocate
> OpenPGP: 0x5DEA789B
> http://systemoverlord.com
> david at systemoverlord.com
>
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--
Byron A. Jeff
Department Chair: IT/CS/CNET
College of Information and Mathematical Sciences
Clayton State University
http://cims.clayton.edu/bjeff
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