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  1. Qt
  2. QTBUG-30682

QPainter scales down badly

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    • Icon: Bug Bug
    • Resolution: Out of scope
    • Icon: Not Evaluated Not Evaluated
    • None
    • 4.8.4, 5.0.2
    • GUI: Painting, WebKit
    • None
    • Windows, Mac

      QPainter with Qt::SmoothPixmapTransform scales down images badly. The quality is the same as when we are scaling via QPixmap with Qt::FastTransformation.

      QPainter is used to scale images for QtWebKit, so there is no clean way to scale down image with normal quality in HTML. See QTBUG-30155

      Take a look at attached program and screen.

        1. bad-low-scale-qpainter.bmp
          147 kB
          Cyril Oblikov
        2. bad-low-scaling.zip
          1.27 MB
          Cyril Oblikov
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            sletta Gunnar Sletta
            munknex Cyril Oblikov
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              Created:
              Updated:
              Resolved:

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