Changes between Initial Version and Version 1 of Ticket #7500


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Timestamp:
May 29, 2011, 10:27:03 PM (13 years ago)
Author:
aldeck
Comment:

I haven't had enough time to test what i wanted, though all i can affirm a that point is that the generic agg implementation of DrawBitmap (Painter.cpp) has the problem. Note that i haven't analyzed the algorithms themselves and don't know if they actually support high quality downscaling. Will possibly look further when i make more time.

cc'ing stippi as i'm sure he has a clue

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  • Ticket #7500

    • Property Cc stippi added
    • Property Keywords aliasing added; moire artifacts removed
    • Property Summary Image scaling (downsampling) shows moire artifacts → Image scaling < 1.0 (downsampling) shows aliasing

  • Ticket #7500 – Description

    initial v1  
    1 Image scaling (downsampling) shows moire artifacts.
     1Image scaling < 1.0 (downsampling) shows aliasing
    22
    3 Can be reproduced with ImageViewer or desktop background with this high resolution test image http://www.eronn.net/camera/test-chart/resolution%20test-chart.jpg
    4 
    5 I believe that the code used is from BBitmap / app_server but feel free to correct the component.
     3Can be reproduced with ImageViewer or desktop background with this high resolution test image http://www.eronn.net/camera/test-chart/resolution%20test-chart.jpg (any highres image with sharp contrasted lines will do)