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Re: [css3-color] ICC implementation

From: David Woolley <forums@david-woolley.me.uk>
Date: Fri, 11 Jul 2008 07:39:08 +0100
Message-ID: <4877000C.80308@david-woolley.me.uk>
To: www-style@w3.org

Chris Murphy wrote:

> And then also that there has been no implementation of gamma correction, 
> and still there is no implementation of gamma (only) correction, Section 
> 3.1.1 which remains in the spec?

Do you mean gamma correction in general, or a CSS specification for it? 
  You can't do transparency or anti-aliasing properly without it 
(although I suspect that a lot of image replacements are not properly 
gamma corrected!).

I would be interested to know how many authors actually understand gamma 
correction.  It is very common on amateur and in house designed web 
sites to find images with gamma 1.0, yet the authors seem to be 
oblivious as to how dark they render).  It is also not that uncommon to 
find ones with the Mac gamma, although they are more likely to come from 
a design agency.  To some extent this is exacerbated because it seems 
that some digital cameras generated gamma 1.0 but label it as sRGB. 
(The problem being that image sensors generally approximate gamma 1.0 
devices, so need gamma correcting for either sRGB use or to achieve 
equal perceptual brightness steps between digitisation levels.  sRGB 
approximates CRT behaviour; the Mac approximates equal perceptual 

Images with bad gamma appear in PDF as well.

David Woolley
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Received on Friday, 11 July 2008 06:38:02 UTC

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