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  1. Qt
  2. QTBUG-73171

QColor::toCmyk(): wrong result value for "black"

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    • 01f090e9e45399f72b8bc73793797d44a69b2a2e (qt/qtbase/5.12)

    Description

      RGB-black (R=0, G=0, B=0) is converted to CMYK(C=1, M=1, Y=1, K=1) instead of CMYK(C=0, M=0, Y=0, K=1), which would be the preferred and correct result.

      Suggested change (qcolor.cpp, toCmyk()):

      if (!qFuzzyIsNull(k - 1)) {
 c = (c - k) / (qreal(1.0) - k);
 m = (m - k) / (qreal(1.0) - k);
 y = (y - k) / (qreal(1.0) - k);
} 
// begin of change --> 
else {
 c = 0;
 m = 0;
 y = 0;
}
// <-- end of change

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            vgt Eirik Aavitsland
            tneuhofer Thomas Neuhofer
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              Created:
              Updated:
              Resolved:

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