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2005-11-01 by Scott Jones
Interseting comments about the variability of our perceptions of tones depending on what surrounds them. Brooks Jensen of LensWork just recently spoke about this on his blog http://www.lenswork.com/lwb.htm And posted a really interesting picture/illustion to demonstrate this: http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
2005-11-01 by Steve Kale
While not B&W (sorry) check out this: http://www.patmedia.net/marklevinson/cool/cool_illusion.html
> From: Scott Jones <peanutdogs@...> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Date: Tue, 01 Nov 2005 17:44:52 -0000 > To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Subject: [Digital BW] re middle grey 50% > > Interseting comments about the variability of our perceptions of tones > depending on what surrounds them. Brooks Jensen of LensWork just > recently spoke about this on his blog > > http://www.lenswork.com/lwb.htm > > And posted a really interesting picture/illustion to demonstrate this: > > http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html > >
2005-11-01 by petexp2
"Interesting comments about the variability of our perceptions of tones > depending on what surrounds them." An excellent demonstration Scott. I guessed as much at first seeing the illusion but still felt compelled to open it in Photoshop and check the tonal values for myself! The colour demo is most interesting too. I did know that you see a colours opposite (complimentary) if you suddenly remove it but the disappearing dots was a surprise . I guess the brain hones in on the thing it is concentrating on and excludes other information. It's no wonder we are such easy prey for illusionists/magicians. Pete Pete.--- In DigitalBlackandWhiteThePrint@...m, Steve Kale <stevekale@b...> wrote: > > While not B&W (sorry) check out this: > > http://www.patmedia.net/marklevinson/cool/cool_illusion.html > > > > From: Scott Jones <peanutdogs@h...> > > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > > Date: Tue, 01 Nov 2005 17:44:52 -0000 > > To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > > Subject: [Digital BW] re middle grey 50% > > > > Interseting comments about the variability of our perceptions of tones > > depending on what surrounds them. Brooks Jensen of LensWork just > > recently spoke about this on his blog > > > > http://www.lenswork.com/lwb.htm > > > > And posted a really interesting picture/illustion to demonstrate this: > > > > http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
> > > > >
2005-11-01 by Brian Ellis
Not to take anything away from Brooks Jensen but this is something that goes back a long, long way in traditional b&w darkroom printing - if you want to lighten an object in the image but for whatever reason it can't be dodged or you don't want to dodge it, darken the area surrounding it and it will look lighter. Sometimes it's surprising how much of the old darkroom stuff carries over in PS, though with much better control than was obtainable in the darkroom.
----- Original Message -----
From: "Scott Jones" <peanutdogs@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, November 01, 2005 12:44 PM
Subject: [Digital BW] re middle grey 50%
Interseting comments about the variability of our perceptions of tones
depending on what surrounds them. Brooks Jensen of LensWork just
recently spoke about this on his blog
http://www.lenswork.com/lwb.htm
And posted a really interesting picture/illustion to demonstrate this:
http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
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