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From: Chong Yidong <cyd@stupidchicken.com>
To: Miles Bader <miles@gnu.org>
Cc: emacs-devel@gnu.org, Jason Rumney <jasonr@gnu.org>
Subject: Re: PNG image files with alpha channel
Date: Thu, 08 May 2008 22:35:52 -0400	[thread overview]
Message-ID: <87ve1o5hmf.fsf@stupidchicken.com> (raw)
In-Reply-To: <87tzh8yfdc.fsf@catnip.gol.com> (Miles Bader's message of "Fri, 09 May 2008 00:39:27 +0900")

Miles Bader <miles@gnu.org> writes:

> So the problem may in fact be something with the libpng 16-to-8-bit
> conversion code...

I found the error.  When setting the background color, we must provide
it in the original bit-depth of the image, even if we call
png_set_strip_16.  So, for 16-bit png images, it's just a matter of
supplying the background color at a 16-bit depth.

I've checked in a fix.




  parent reply	other threads:[~2008-05-09  2:35 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-08  4:46 PNG image files with alpha channel Miles Bader
2008-05-08 11:48 ` Chong Yidong
2008-05-08 12:05   ` Jason Rumney
2008-05-08 15:02     ` Miles Bader
2008-05-08 15:18       ` Jason Rumney
2008-05-08 15:39         ` Miles Bader
2008-05-08 15:51           ` Jason Rumney
2008-05-08 18:19           ` Chong Yidong
2008-05-09  1:00           ` Chong Yidong
2008-05-09  1:10             ` Miles Bader
2008-05-09  2:35           ` Chong Yidong [this message]
2008-05-08 23:47         ` James Cloos
2008-05-09  0:43           ` Miles Bader

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