XnView: MP 0.84
OS: Windows 10 - 64 bit
When high quality zooming into a 4-color greyscale image you will see artefacts even though the original image is completely white.
Effect: Unexpected behaviour
To reproduce:
1. Download and save the attached PNG image file.
2. Open the PNG image file in XnView's viewer (View mode).
Please note that the image doesn't contain anything and is completely white. (correct)
3. Convert the image to a 4-colour greyscale image (Image » Change Colour depth). When converting, don't use any dithering ("None").
4. Select "Zoom in" for "High zoom quality" in Tools » Settings | View | View.
5. Zoom slowly into the image
Actual behaviour (bug): When zooming into the white image you see a "grid" of black pixels at 200%, 400%, 800%, and 1600%.
Expected behaviour: When zooming into a white image you should see white - nothing else.
Note: The problem might be related to 0.84: Crash when high quality zooming b/w image.
0.84: Artefacts when high quality zooming 4-color greyscale
Moderators: XnTriq, helmut, xnview, Dreamer
0.84: Artefacts when high quality zooming 4-color greyscale
- Attachments
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- white_blank.png (3.05 KiB) Viewed 949 times
Re: 0.84: Artefacts when high quality zooming 4-color greysc
Could someone please try to reproduce the problem?
Re: 0.84: Artefacts when high quality zooming 4-color greysc
Confirmedhelmut wrote:When zooming into the white image you see a "grid" of black pixels at 200%, 400%, 800%, and 1600%.
Related bug in XnView Classic: Faint grid overlayed on high quality downsampled view
Re: 0.84: Artefacts when high quality zooming 4-color greysc
Thank you for confirming, XnTriq.
Reproduced
Reproduced
Re: 0.84: Artefacts when high quality zooming 4-color greyscale
O.k., thank you, I can also reproduce the problem. Issue 1237 is fixed in next version.
Pierre.
Re: 0.84: Artefacts when high quality zooming 4-color greyscale
This problem is supposed to be fixed in XnView MP 0.87. Please check and confirm the bug fix here.
Pierre.
Re: 0.84: Artefacts when high quality zooming 4-color greyscale
Tested in 0.87 beta 3: Fixed!