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Grid lines appearing with Alpha on TGAs

Posted: Fri Dec 04, 2015 5:26 pm
by insyami
I've used XnView for quite some time, and decided to try out XnViewMP because its UI is a little bit more polished and straightforward, however, I'm having what I believe is a bug when previewing TGAs with the alpha channel enabled. Here is the same file open on both XnView and XnViewMP with the Alpha channel disabled:

Image

Everything looks fine, but here's what happens when I enable the Alpha channel:

Image

Lots of grid lines appear over the image. They disappear if the zoom is on 100%, but appear again as soon as I zoom in or out, which makes me believe it's an issue with how the zoom function works.

Re: Grid lines appearing with Alpha on TGAs

Posted: Mon Dec 07, 2015 9:18 am
by xnview
yes a known issue

Re: Grid lines appearing with Alpha on TGAs

Posted: Wed Jan 13, 2016 2:02 pm
by jumo
It seems, I got the same issue on PNG.
It becomes very inacurate on few pixel wide images:
(eg: Image)

Is there any plan to fix it ?

Re: Grid lines appearing with Alpha on TGAs

Posted: Fri May 20, 2016 5:44 pm
by Timmyfox
Still having this issue on 64-bit MP-version with PNG files, driving me nuts..

Re: Grid lines appearing with Alpha on TGAs

Posted: Thu Feb 23, 2017 9:21 pm
by helmut
This problem is supposed to be fixed in XnView MP 0.84. Could you (insyami / jumo, / Timmyfox) please try and confirm the bug fix?

Related bug report:
- 0.68: Discontinuities when downscaling large images