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XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Mon Feb 04, 2019 6:57 pm
by masterjp
Does somebody know, why Windows 10 64bit and Android 7.x or (higher) smartphones/tablets could not show WebP image files with 32bit colour depth?
Is it a new feature of WebP 1.0 ? Do the operating systems use old webp libraries?

I saved the images with XnViewMP to WebP format. Other Windows picture viewers do not have any problem.

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Tue Feb 05, 2019 8:52 am
by xnview
i don't know, what do you use on Windows 10, by default it can't read webp

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Tue Feb 05, 2019 4:44 pm
by masterjp
I use the icaros thumbnail generator for video files and I think it generates thumbnails for pictures, too.
Website: http://shark007.net/tools.html

If I save a picture to webp format with 24bit, everything is correct! - Strange.
Only 32 bit colour depth is the problem.

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Tue Feb 05, 2019 6:58 pm
by xnview
and 32bits webp saved by older version has the same problem?

Re: XnViewMP 0.93 (Win10) - Batch conversion - problem with 32bit color depth

Posted: Wed Feb 06, 2019 8:56 pm
by masterjp
Something in the batch conversion mode is the problem of incompatible or damaged webp files!

I saved my Photoshop file with 32bit colour depth with XnView 2.47 and XnView MP to webp format with 90% quality and the Windows Explorer has no problem with it! Then I converted the same Photoshop file with XnViewMP and XnConvert in batch conversion mode to webp format with the same quality setting (90%) and the windows explorer will not show the thumbnail! Futhermore the filesizes of the created webp files are different, although I used the same settings for quality!

In the attachment you can find the two saved webp files to compare them yourself. I resized the original psd file for you to get under the required 2 MB attachment limit.

Re: XnViewMP 0.93 (Win10) - Batch conversion - problem with 32bit color depth

Posted: Thu Feb 07, 2019 8:16 am
by xnview
masterjp wrote:
Wed Feb 06, 2019 8:56 pm
I saved my Photoshop file with 32bit colour depth with XnView 2.47 and XnView MP to webp format with 90% quality
With XnView MP 0.93 in edit mode?

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Thu Feb 07, 2019 8:50 am
by masterjp
Yes.

XnViewMP:

1. File => Open ... (select Media Harbour Race test.psd)
2. File => Export ...
3. Webp file Format => Quality=90%, Compression method =6, Filter strength= 20, Filter sharpness = 0

The produced webp file is fine.

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Thu Feb 07, 2019 2:22 pm
by xnview
ok, i can reproduce, the problem comes from Metadata written & 32bits webp

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Thu Feb 07, 2019 4:18 pm
by masterjp
Fantastic, you found the reason! :D

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Thu Mar 07, 2019 4:00 pm
by xnview
This problem is supposed to be fixed in XnView MP 0.93.1. Please check and confirm the bug fix here.

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Tue Sep 17, 2019 10:22 am
by xnview
This problem is supposed to be fixed in XnView MP 0.94. Please check and confirm the bug fix here.

Re: XnViewMP 0.93 (Win10) - WebP with 32bit colour depth problem

Posted: Tue Sep 17, 2019 6:03 pm
by masterjp
Good solution! For me it is fine.