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  1. Qt
  2. QTBUG-101173

Qt6 QImage::scaled is faulty

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Details

    • Bug
    • Resolution: Invalid
    • P2: Important
    • None
    • 6.2.2
    • GUI: Painting
    • None
    • macOS

    Description

      QImage::scaled(,,,Qt::SmoothTransformation) in QT6 has spot noise or dither in the scaled output and looks bad. The same function in QT5 gives a smooth output.

      The fourth parameter defaults to Qt::FastTransformation but I am using Qt::SmoothTransformation.

      Screenshots from Qt6 and Qt5 are attached.

      I have only checked on macOS but if the code is different on Windows, someone should check that also.

      Please fix ASAP. I'm a Qt Commercial licensee about to re-release my products compiled with Qt6 and this bug is holding me up.

       

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            allan.jensen Allan Sandfeld Jensen
            mjsmithers Michael Smithers
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            Dates

              Created:
              Updated:
              Resolved:

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