[haiku-bugs] Re: [Haiku] #7500: Image scaling < 1.0 (downsampling) shows aliasing (was: Image scaling (downsampling) shows moire artifacts)
- From: "aldeck" <trac@xxxxxxxxxxxx>
- Date: Sun, 29 May 2011 22:27:03 -0000
#7500: Image scaling < 1.0 (downsampling) shows aliasing
-------------------------+-------------------------------------------------
Reporter: aldeck | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: | Version: R1/Development
Servers/app_server | Keywords: image scaling downsampling aliasing
Resolution: | Blocking:
Blocked By: | Platform: All
Has a Patch: 0 |
-------------------------+-------------------------------------------------
Changes (by aldeck):
* cc: stippi (added)
* keywords: image scaling downsampling moire artifacts => image scaling
downsampling aliasing
Old description:
> Image scaling (downsampling) shows moire artifacts.
>
> 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
>
> I believe that the code used is from BBitmap / app_server but feel free
> to correct the component.
New description:
Image scaling < 1.0 (downsampling) shows aliasing
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 (any highres image with sharp contrasted lines will do)
--
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
--
Ticket URL: <http://dev.haiku-os.org/ticket/7500#comment:1>
Haiku <http://dev.haiku-os.org>
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Other related posts:
- » [haiku-bugs] Re: [Haiku] #7500: Image scaling < 1.0 (downsampling) shows aliasing (was: Image scaling (downsampling) shows moire artifacts) - aldeck
