2009.12.28 19:46 "Re: [Tiff] bug in tiff2pdf, when handling Lab images", by Manlio Perillo
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Sergius Bobrovsky ha scritto:
> recently, I've faced this problem too.
> trying to fix this bug i found that tiff2pdf just do not write > /BlackPoint before second array.
> in other words, correct dictionary should be something as following:
> /ColorSpace [/Lab <<
> /WhitePoint [0.9643 1.0000 0.8251]
> /BlackPoint [0.9643 1.0000 0.8251]
> /Range [-127 127 -127 127]
No, this is wrong.
Try to open the resulting document with Acrobat Reader!
The BlackPoint can not be the same as WhitePoint.
As far as I understand, Acrobat reader use the value of BlackPoint for gamut mapping.
Other viewers (like KPDF) don't do gamut mapping, so the image rendering is the same.
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