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Bugfixing: soft mask

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Jakub Melka
2021-03-26 19:35:33 +01:00
parent 1b801a2b2a
commit 39ebe08847
3 changed files with 29 additions and 1 deletions
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3
Pdf4QtLib/sources/pdfblendfunction.cpp
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@ -519,7 +519,8 @@ PDFColorComponent PDFBlendFunction::getLuminosity(PDFRGB rgb)
PDFColorComponent PDFBlendFunction::getLuminosity(PDFCMYK cmyk)
{
return nonseparable_Lum(nonseparable_cmyk2rgb(cmyk));
// This is according to chapter 11.5.3, deriving soft mask from a group luminosity
return 1.0f - qMin(1.0f, 0.30f * cmyk[0] + 0.59f * cmyk[1] + 0.11f * cmyk[2] + cmyk[3]);
}
PDFRGB PDFBlendFunction::nonseparable_gray2rgb(PDFGray gray)