unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87ve1o5hmf.fsf@stupidchicken.com \
    --to=cyd@stupidchicken.com \
    --cc=emacs-devel@gnu.org \
    --cc=jasonr@gnu.org \
    --cc=miles@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).