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Posted to batik-users@xmlgraphics.apache.org by Philip Arad <ph...@hotmail.com> on 2002/01/28 15:05:34 UTC
Gamma correction in IE5.5
Gamma correction with IE5.5
Batik is using a Gamma correction of 2.2.
When I render an image to PNG with this correction, I receive
the right color (if you open the image with Photoshop, for
example), but when displaying the image in IE5.5, the image
has darker colors. After a while, I understood that IE5.5
is using another Gamma correction. After some experiments I found out
that it is approximately : 1.942F.
I couldnt found a way to set the gamma when I made a new
PNGTranscoder, so I had to replace it manualy in the program.
Only in this way I could make the right correction:
// We are using sRGB (gamma 2.2).
//params.setSRGBIntent(PNGEncodeParam.INTENT_PERCEPTUAL);
params.setGamma(1.0F/1.942F);
(This a part of PNGTranscoder.java)
Any suggestions?
Philip
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Re: Gamma correction in IE5.5
Posted by Thierry Kormann <tk...@ilog.fr>.
On Monday 28 January 2002 15:05, Philip Arad wrote:
> Gamma correction with IE5.5
>
> Batik is using a Gamma correction of 2.2.
> When I render an image to PNG with this correction, I receive
> the right color (if you open the image with Photoshop, for
> example), but when displaying the image in IE5.5, the image
> has darker colors. After a while, I understood that IE5.5
> is using another Gamma correction. After some experiments I found out
> that it is approximately : 1.942F.
>
> I couldnt found a way to set the gamma when I made a new
> PNGTranscoder, so I had to replace it manualy in the program.
> Only in this way I could make the right correction:
>
> // We are using sRGB (gamma 2.2).
> //params.setSRGBIntent(PNGEncodeParam.INTENT_PERCEPTUAL);
> params.setGamma(1.0F/1.942F);
> (This a part of PNGTranscoder.java)
>
> Any suggestions?
Please, add a bug report to batik using bugzilla.
I will add ASAP a new TranscodinHint to the PNGTranscoder that will let you
specify the gamma correction.
Thierry.
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