XnView: Version 0.99.1 64bits (Sep 23 2021) - thanks for new version with speed improvement.
OS: Windows 10 64bit
Bug: "High quality zoom-out" (image reduction) settings (settings -> view -> high quality zoom-out) for filters called lanczos, spline and bicubic don't work.
They all look like billinear. Only "High quality zoom-in" (image enlarge) works as expected.
This bug doesn't exist in Version 0.98.2 64bits (Feb 19 2021), before "2043: [New] Zoom out filter (Bicubic, Spline, Lanczos)" was introduced.
For some reason, Version 0.98.2 has "1958: [New] Zoom-in filter (Bicubic, Spline, Lanczos)" feature, but actually this feature is zoom-out (reduction).
Version 0.99.1 has "2043: [New] Zoom out filter (Bicubic, Spline, Lanczos)" feature, but actually this feature is zoom-in (enlarge).
Image compare lanczos4 algorithm for "zoom-out" at 99% level. Look only at 100% in image viewer. Version 0.99.1 at the right is blurry.
Test images from:
http://www.falklumo.com/lumolabs/articles/sharpness/
"High quality Zoom-out" lanczos-spline-bicubic filters don't work
Moderators: helmut, XnTriq, xnview, Dreamer
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"High quality Zoom-out" lanczos-spline-bicubic filters don't work
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- Author of XnView
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Re: "High quality Zoom-out" lanczos-spline-bicubic filters don't work
"High quality zoom-out" use always bilinear, the setting is for High quality zoom-in
Pierre.
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- Posts: 3
- Joined: Fri Sep 24, 2021 3:31 pm
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- Author of XnView
- Posts: 37889
- Joined: Mon Oct 13, 2003 7:31 am
- Location: France
Re: "High quality Zoom-out" lanczos-spline-bicubic filters don't work
in 0.98.2, it was a bug
Pierre.
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Re: "High quality Zoom-out" lanczos-spline-bicubic filters don't work
I dont know, how it is bug, if:
Version 0.98.1, where high quality lanczos-spline-bicubic filters was officially introduced, shows lanczos zoom out perfectly.
Only starting with 0.98.3, when high quality lanczos-spline-bicubic "zoom out" was introduced, also bug was introduced, which destroy ACTUAL high quality lanczos-spline-bicubic zoom out and replaced it with high quality lanczos-spline-bicubic zoom in. In photography sharp zoom out is much more important, than sharp zoom in. Bicubic-spline-lanczos algorithm recommended for zoom out. And billinear recommended for zoom in. Xnview not just has this bug, but works not as expected by image editors and in pro photo, using resource-cheap billinear zoom out as 1990-early 200X programs.
Please fix this bug, or return back destroyed "Bicubic-spline-lanczos zoom out", so xnview will have Bicubic-spline-lanczos algorithms for both zoom in and zoom out. Version 0.98.2 is latest, which I can use. 0.99.1 is blurry and ugly, it and newer versions will be abandoned by me and other users (to which high quality matter), until bug will be fixed.
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