GNU bug report logs - #59242
29.0.50; Poor quality for WebP images

Previous Next

Full log

View this message in rfc822 format

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: luangruo <at> yahoo.com, 59242 <at> debbugs.gnu.org, lg.zevlg <at> gmail.com
Subject: bug#59242: 29.0.50; Poor quality for WebP images
Date: Mon, 14 Aug 2023 05:33:09 +0300

> Cc: 59242 <at> debbugs.gnu.org, Evgeny Zajcev <lg.zevlg <at> gmail.com>
> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Mon, 14 Aug 2023 02:11:56 +0200
> 
> Po Lu <luangruo <at> yahoo.com> writes:
> 
> > > Evgeny Zajcev <lg.zevlg <at> gmail.com> writes:
> >
> > > Looks like partial transparency is incorrectly applied for webp images.
> 
> Thanks for the bug report.
> 
> > Stefan, I see the following code in image.c:
> [...]
> > So if the webp library does not blend itself, I think we will have to do
> > that for it.  Am I missing anything here?
> 
> Yes, the old code was not right.  The attached patch should add proper
> alpha blending for webp images.  I have tested it with the example
> images here: https://developers.google.com/speed/webp/gallery2
> 
> Evgeny, could you please test this patch and report back?  It should
> apply cleanly both against master and emacs-29.

Thanks, but please install this on master, not on the emacs-29 branch,
even if this patch does work.  It's too late for such changes on the
release branch.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.