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  1. Qt
  2. QTBUG-41590

Pale text rendering on Linux compared to Qt4

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.4.1
    • 5.3.2
    • GUI: Font handling, GUI: Painting
    • None
    • Arch Linux x86_64, Qt 5.3.2
    • 501c510cc3cb6215aed27af7599395480a049667

    Description

      I have pale text rendering in Linux with freetype2-infinality and custom FIR filter (INFINALITY_FT_FILTER_PARAMS="06 18 33 18 06"). This behaviour was introduces in the Qt5, the Qt4 is not affected. The screenshot is attached (Qt4 assistant and Qt5 assistant are shown side by side). I found that problem is related to the gamma tables. So I've made a hack, which fixes this issue by disabling the text gamma correction completely (patch is attached). Maybe someone knows, how to make a correct fix?

      Attachments

        1. BlendingExamples.png
          870 kB
          octoploid
        2. disable-font-gamma-correction.patch
          0.9 kB
          Anton Kalmykov
        3. qt-5.3.2-xcb-gamma-tweaks.patch
          0.6 kB
          NiLuJe
        4. qt-font-rendering.png
          204 kB
          Anton Kalmykov

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-37749 In version >= 3 colors are much brighter and antialising is worse

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-44177 Qt5 fonts looks different from QT4 fonts

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-28653 Font rendering regression on mac

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-42564 Windows: Don't do GDI workarounds if using FreeType

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          replaces

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-40971 [Linux] Thin/Grey font rendering on Qt5 with antialiasing enabled

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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          Activity

            People

              allan.jensen Allan Sandfeld Jensen
              phant0m Anton Kalmykov
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              Dates

                Created:
                Updated:
                Resolved:

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