D12756: [KDateTable] Use more appropriate and readable text colors for weekends and holidays

[Christoph Feck]

cfeck removed a reviewer: VDG.
cfeck added a comment.


    QColor c;
    c = QColor(Qt::gray);
    qDebug() << c.lightnessF();
    c = QColor(Qt::darkGray);
    qDebug() << c.lightnessF();
  
  I get:
  0.635294
  0.501961
  
  Both colors are very similar and neither has enough contrast for background colors with lightness at 0.55.
  
  Additionally, I would prefer computing the brightness of a color using qGray() or something similar to account for the different luminances of the primary colors.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D12756

To: ngraham, #frameworks, #vdg
Cc: alex-l, rkflx, cfeck, kde-frameworks-devel, mwolff, apol, michaelh, ngraham, bruns
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