WEBP images are distorted in 8.8.3.28

[Balzhur]

System information:

• Windows OS version: Win 11 x64
• ImageGlass version: 8.8.3.28 x64, purchased at Windows Store

To Reproduce

Steps to reproduce the behavior:

1. Open any WEBP image, zoom to 100%
2. Compare to the same image opened in Firefox, Chrome, Edge or any other image viewer

Actual behavior:

Image opened in ImageGlass looks distorted.
I'm using "High-quality, bicubic" zoom optimization, switching optimization algorithms does not improve the situation.
Images are grainy and distorted. Situation is even worse with animated images.

Expected behavior:

Image zoomed looks smooth and not grainy.

Screenshots:

Additional context:

I suspect this is due to "directly using libwebp v1.3.0", previous ImageGlass version did not have this issue.

[Balzhur]

Samle image on screenshot taken from here - 500KB version.

[Balzhur]

@d2phap, would you fix it in 8.x?

[d2phap]

It's fixed in v9 branch and will be included in v9.0 beta 4. However, it requires a lot of work for v8 to do the same, so I added a fall-back feature that it will use MagickNET to load animated WEBP (as same as v8.7) if the libwebp.dll is not found.

It means, you will just delete libwebp.dll to use the animated WEBP function from v8.7. The new update will be released by 4/4.

[d2phap]

I released v8.8.4.4 which you can just delete the libwebp.dll to use the MagickNET's animated WebP. ImageGlass 8.8 converts WebP frames to Gif format to use Gif animator, that's why it loses the quality.

It's totally fixed in v9.0 beta 4 which will be also released soon. WebP frames are directly rendered using the GPU without converting to Gif format, resulting in a significant performance boost.

[Balzhur]

Thank you. Workaround (deleting libwebp.dll) works as expected in 8.8.4.4. Non-animated WEBP images are also displayed properly.
As for 9.x beta branch - well, if you kindly fix the settings editing from the GUI, it would be usable, for now it's too much hassle to tinker with config file, at least for me.