From: Jason Rumney <jasonr@gnu.org>
To: Miles Bader <miles@gnu.org>
Cc: Chong Yidong <cyd@stupidchicken.com>, emacs-devel@gnu.org
Subject: Re: PNG image files with alpha channel
Date: Thu, 08 May 2008 16:18:46 +0100 [thread overview]
Message-ID: <482319D6.1020308@gnu.org> (raw)
In-Reply-To: <87zlr0yh2y.fsf@catnip.gol.com>
Miles Bader wrote:
> Perhaps there's some header info that emacs wants which isn't there?
>
> I write the header like:
>
> png_set_IHDR (libpng_struct, libpng_info, width, height,
> 8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
> PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
> png_set_gAMA (libpng_struct, libpng_info, gamma_correction);
>
Is there any program that can dump a PNG header in some readable format,
so we can compare yours with the image that Gimp saves?
Or maybe someone needs to step through the PNG display code in Emacs,
and see where it (or libpng) makes the wrong decision.
next prev parent reply other threads:[~2008-05-08 15:18 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 [this message]
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
2008-05-08 23:47 ` James Cloos
2008-05-09 0:43 ` Miles Bader
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