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From: "Roland Winkler" <winkler@gnu.org>
To: mituharu@math.s.chiba-u.ac.jp
Cc: 37153@debbugs.gnu.org, Paul Eggert <eggert@cs.ucla.edu>
Subject: bug#37153: 26.1; some png images scrambled
Date: Sat, 24 Aug 2019 23:52:32 -0500	[thread overview]
Message-ID: <5136.20784.40920.23906@gargle.gargle.HOWL> (raw)
In-Reply-To: <9c4c68ebe20cbcc44763be8e72bd25eb.squirrel@weber.math.s.chiba-u.ac.jp>

On Sat Aug 24 2019 mituharu@math.s.chiba-u.ac.jp wrote:
> I suspect there is a longstanding typo (or thinko) in PNG
> transparency handling code.

It may be helpful to check the "official" test-suite for PNG

http://www.schaik.com/pngsuite2011/pngsuite.html

which contains also png files with transparency

http://www.schaik.com/pngsuite2011/pngsuite_trn_png.html

Somehow emacs ignores the transparency for image type png, see for
example the file tm3n3p02.png with multiple levels of transparency.

Transparency is honored for these images when emacs uses imagemagick.





  parent reply	other threads:[~2019-08-25  4:52 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23  4:49 bug#37153: 26.1; some png images scrambled Roland Winkler
2019-08-23  8:47 ` Eli Zaretskii
2019-08-23 11:39   ` Roland Winkler
2019-08-23 12:22     ` Eli Zaretskii
2019-08-23 15:07       ` Roland Winkler
2019-08-23 15:34         ` Eli Zaretskii
2019-08-23 19:37 ` Paul Eggert
2019-08-23 20:11   ` Eli Zaretskii
2019-08-23 20:33     ` Paul Eggert
2019-08-24  5:51       ` Eli Zaretskii
2019-08-24  3:17   ` Roland Winkler
2019-08-24  3:39     ` Paul Eggert
2019-08-24  4:19       ` Roland Winkler
2019-08-24  6:26       ` Eli Zaretskii
2019-08-24  6:22     ` Eli Zaretskii
2019-08-24  9:01     ` mituharu
2019-08-24 10:17       ` Eli Zaretskii
2019-08-25  4:19         ` YAMAMOTO Mitsuharu
2019-08-25  7:24           ` Eli Zaretskii
2019-08-25  4:52       ` Roland Winkler [this message]
2019-08-25  6:58         ` YAMAMOTO Mitsuharu
2019-08-25 12:19           ` Roland Winkler
2019-08-25 18:38           ` Paul Eggert
2019-08-25 18:56             ` Eli Zaretskii
2019-08-25 23:02             ` YAMAMOTO Mitsuharu
2019-08-25 23:06               ` YAMAMOTO Mitsuharu
2019-08-25 23:39               ` Paul Eggert
2019-09-24 16:23                 ` Lars Ingebrigtsen
2019-09-24 17:14                   ` Eli Zaretskii

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