Subject:
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Gamma correction (was Re: color, contrast and brightness problems - any idea?)
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Newsgroups:
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lugnet.cad.ray
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Date:
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Wed, 12 May 2004 19:02:37 GMT
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Viewed:
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2227 times
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In lugnet.cad.ray, Sven Reger wrote:
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Hi all,
I have a problem and no idea hox to fix it. I’m working on a notebook with
active tft-display. Rendered pictures seem to be brilliant with enough
brightness and contrast. Whenever I see one of these pictures on a PC with
CRT I’m shocked. Discoloured, too dark and so on... If I use a normal PC &
CRT to render the picture and I adjust brightness and all other settings
there the picture has too much brightness on my notebook. I can’t raise
contrast & brightness on my crt so much that it looks like the tft. Any other
idea how to fix that?
Just one example here. The background of this picture is milky white on my
notebook but kind of pink on any crt.
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=752484
TIA
Sven
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Basically, the problem you’re seeing is that Windows does no gamma correction,
and your two machines have different monitor gammas. (see
http://www.cgsd.com/papers/gamma_intro.html for an explanation)
To fix this, in theory, you basically have to calculate your current monitor’s
gamma, tell POV what that is, and then save your image in a file format that
understands and corrects for it (i.e., save as a .PNG). In practice, this still
might not fix your problem, since the PNG display program still has to guess
what the display gamma is on most machines.
To roughly determine your monitors gamma, squint at this image:
Where the right side appears to be the same grayscale value as the left, that is
your monitor’s gamma. I don’t know how to feed this into POV, check the
documentation.
Andy
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Message has 1 Reply:
Message is in Reply To:
 | | color, contrast and brightness problems - any idea?
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| Hi all, I have a problem and no idea hox to fix it. I'm working on a notebook with active tft-display. Rendered pictures seem to be brilliant with enough brightness and contrast. Whenever I see one of these pictures on a PC with CRT I'm shocked. (...) (20 years ago, 11-May-04, to lugnet.cad.ray, FTX)
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