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  1. Qt
  2. QTBUG-20304

Loss of quality when using QImage for text rendering

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Not Evaluated
    • Resolution: Out of scope
    • Affects Version/s: 4.7.3
    • Fix Version/s: None
    • Component/s: GUI: Painting
    • Labels:
      None
    • Environment:
      Symbian Wk_25

      Description

      Hi,

      Our team is rendering text on QImage but found that the text is not legible when used with small font sizes. We observed that rendering directly onto a Widget in the paint event results in much better quality, while using the existing approach of rendering text on to a QImage and then putting that QImage on to the screen, results in visible loss of quality for text. Please see the attached screenshot (TextRenderingIssue_Emulator_wk25.JPG) to understand this issue.

      The "Hell World" text on the left side of the screenshot is rendered using QImage, where as the right side "Hello World" text is rendered directly on a widget inside a paint event. Please find attached sample application (TextRenderingOnQImageTestApp.zip file) to reproduce this issue on your side.

      Can Qt suggest remedy for this visible loss of quality?

      Thanks & Regards,
      BalaSubrahmanyam Varanasi

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            • Assignee:
              portale Alessandro Portale
              Reporter:
              baluvaranasi BalaSubrahmanyam Varanasi
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              Dates

              • Created:
                Updated:
                Resolved:

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