Problem with transparency,

[mizka76]

Version information

hello,
With the last nightly version

I got this when deleting a white background on a jpg image ( with the magic wand) and then convert it to webp. i tried again with another image, deleting with the eraser , same kind of result .....
i didn't edit image before , Two daus ago, I just needed to open an avif file so PhotoDemon uploaded the library to open it -- don't know if it have some link...
I hope this helps you .

Thank you for all your great work !

[mizka76]

hello aggain,
maybe on bad compressed jpg files ? it tried again on other images, the transparency is ok, ( i re opened photodemon, changes many times parameters , (generic, better etc ) and it is now ok .

[tannerhelland]

Hello @mizka76 . Thank you for posting this issue!

The nature of the bug looks like something may be happening inside libwebp (the official Google WebP library that PhotoDemon uses for WebP files). There is a newer version of libwebp available that may include a fix for this. It will take me a few days, but I will work on getting that new version integrated into PhotoDemon nightly builds.

If you are able to reproduce the problem, I would be very grateful for a screenshot of the WebP settings that cause it. (It is likely a specific combination of image file + WebP settings - for example sometimes there are bugs that only occur at specific image dimensions.)

Thank you so much in advance, and I will report back when I have the latest libwebp added to nightly builds.

[tannerhelland]

Okay, I lied - it didn't take a week! I pushed a new nightly build tonight with an updated copy of libwebp right now (v1.5.0 instead of the old 1.4.0) 😄

I hope that solves this problem, but if not please let me know and I will dig deeper. Thank you!

[mizka76]

Thaaaanks a lot ! good week end ! Le ven. 14 févr. 2025 à 23:34, Tanner ***@***.***> a écrit :

…

Okay, I lied - it didn't take a week! I pushed a new nightly build tonight with an updated copy of libwebp right now (v1.5.0 instead of the old 1.4.0) 😄 I hope that solves this problem, but if not please let me know and I will dig deeper. Thank you! — Reply to this email directly, view it on GitHub <#639 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APAABPGJHV4AQQ76KURJ34D2PZVPLAVCNFSM6AAAAABXFKOS3KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNRQGM4DSNZYG4> . You are receiving this because you were mentioned.Message ID: ***@***.***> [image: tannerhelland]*tannerhelland* left a comment (tannerhelland/PhotoDemon#639) <#639 (comment)> Okay, I lied - it didn't take a week! I pushed a new nightly build tonight with an updated copy of libwebp right now (v1.5.0 instead of the old 1.4.0) 😄 I hope that solves this problem, but if not please let me know and I will dig deeper. Thank you! — Reply to this email directly, view it on GitHub <#639 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APAABPGJHV4AQQ76KURJ34D2PZVPLAVCNFSM6AAAAABXFKOS3KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNRQGM4DSNZYG4> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[tannerhelland]

I tried batch converting more WebP images with transparency today, but haven't been able to turn up the error described above. I'm hopeful that the latest libwebp has fixed everything...?

If you encounter this problem again, please let me know and I will investigate further. Thank you again for the bug report!