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How to display clear images with QPixmap?

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  • Q Offline
    Q Offline
    Quella
    wrote on last edited by
    #1

    When using QPixmap to load an image, if the size of the image file is 1000*1000 and the size of the image control is 32*32, there may be a grainy feeling or distortion when the screen resolution is 1080*1920 and the scaling ratio is 100%.
    What can I do to show a clear picture?

    Christian EhrlicherC 1 Reply Last reply
    0
    • Q Quella

      When using QPixmap to load an image, if the size of the image file is 1000*1000 and the size of the image control is 32*32, there may be a grainy feeling or distortion when the screen resolution is 1080*1920 and the scaling ratio is 100%.
      What can I do to show a clear picture?

      Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Do you really think you can downsize an image to 3% without loosing quality? Use a smaller source image.

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

      JonBJ Q 2 Replies Last reply
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      • Christian EhrlicherC Christian Ehrlicher

        Do you really think you can downsize an image to 3% without loosing quality? Use a smaller source image.

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #3

        @Christian-Ehrlicher Or one with few pixels different from all the single background one... ;)

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        • Christian EhrlicherC Christian Ehrlicher

          Do you really think you can downsize an image to 3% without loosing quality? Use a smaller source image.

          Q Offline
          Q Offline
          Quella
          wrote on last edited by
          #4

          @Christian-Ehrlicher Can I do this by compressing the image?

          Christian EhrlicherC 1 Reply Last reply
          0
          • Q Quella

            @Christian-Ehrlicher Can I do this by compressing the image?

            Christian EhrlicherC Offline
            Christian EhrlicherC Offline
            Christian Ehrlicher
            Lifetime Qt Champion
            wrote on last edited by
            #5

            @Quella I don't see what compression had to do with downscaling. Use a smaller image.

            Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
            Visit the Qt Academy at https://academy.qt.io/catalog

            Q 1 Reply Last reply
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            • Christian EhrlicherC Christian Ehrlicher

              @Quella I don't see what compression had to do with downscaling. Use a smaller image.

              Q Offline
              Q Offline
              Quella
              wrote on last edited by
              #6

              @Christian-Ehrlicher Got it. Thanks for your answer.

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