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  1. Qt
  2. QTBUG-90246

QImage::scale doesn't work for Format_Grayscale16 images

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Details

    • Windows
    • ade24763c74ce506276218ec1ce0e307301717fe (qt/qtbase/dev) 978131ba7106df99e010f5ea5559204424f29ab7 (qt/qtbase/6.0) 625a0d57aff2c0f42c832eabcc123778e0374922 (qt/tqtc-qtbase/tqtc/lts-5.15)

    Description

      If you try to scale a QImage::Format_Grayscale16 image the generated image is wrong. I attach a 16 bit image to test.

      QImage roi;
roi.load("roiImg.png");
auto scaledRoi = roi.scaled(roi.width()/2, roi.height()/2, Qt::KeepAspectRatio);
scaledRoi.save("roiImgScaled.png");

      This bug also affects QPainter::drawImage().

      Attachments

        1. roiScaled.png
          roiScaled.png
          3 kB
        2. roiImg.png
          roiImg.png
          2.31 MB
        For Gerrit Dashboard: QTBUG-90246
        # Subject Branch Project Status CR V
        330060,2 Fix convertToRGBA64PM for Grayscale16 dev qt/qtbase Status: MERGED +2 0
        330264,2 Fix convertToRGBA64PM for Grayscale16 6.0 qt/qtbase Status: MERGED +2 0
        330348,3 Fix convertToRGBA64PM for Grayscale16 tqtc/lts-5.15 qt/tqtc-qtbase Status: MERGED +2 0

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          People

            allan.jensen Allan Sandfeld Jensen
            gghelli Gianluca Ghelli
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            Dates

              Created:
              Updated:
              Resolved:

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