Your message dated Sat, 9 May 2009 21:39:44 +0200
with message-id <[email protected]>
and subject line Done: imagemagick: convert changes bitdepth
has caused the Debian Bug report #472699,
regarding imagemagick: convert changes bitdepth
to be marked as done.
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472699: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=472699
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: imagemagick
Version: 7:6.3.7.9.dfsg1-2+b1
Severity: normal
For some reason, "convert" changes the bitdepth of an image. For
example, I am trying to resize a jpeg to a smaller png. The jpeg is in
8-bit/channel. The resulting png is 16-bit/channel. This behavior is
different from previous versions, for example 6.2.4.5 (tested from
Ubuntu gutsy).
Example:
mst...@gs3020:~$ identify dsc00083.jpg
dsc00083.jpg JPEG 1632x1224 1632x1224+0+0 DirectClass 8-bit 374.189kb
mst...@gs3020:~$ convert -geometry 800x600 dsc00083.jpg dsc00083_resized.png
mst...@gs3020:~$ identify dsc00083_resized.png
dsc00083_resized.png PNG 800x600 800x600+0+0 DirectClass 16-bit 2.31643mb
There is an old note (from 2002) in the documentation that says if one
doesn't like 16-bitness, to use the -depth 8 cmd-line option. However,
I don't think this bug is related to that note, since the 6.2.4.5
version included the same note and works as expected. Furthermore, the
documentation for the -depth cmd-line option says that it is only used
to /change/ the depth of an image. Hence, if I read an 8-bit/channel
image, I expect it to be processed and written out as an 8-bit/channel
image, unless I explicitly ask for a conversion via -depth.
Thanks,
Martin
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.22-3-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages imagemagick depends on:
ii libbz2-1.0 1.0.4-4 high-quality block-sorting file co
ii libc6 2.7-9 GNU C Library: Shared libraries
ii libfontconfig1 2.5.0-2 generic font configuration library
ii libfreetype6 2.3.5-1+b1 FreeType 2 font engine, shared lib
ii libice6 2:1.0.4-1 X11 Inter-Client Exchange library
ii libjpeg62 6b-14 The Independent JPEG Group's JPEG
ii liblcms1 1.16-8 Color management library
ii libmagick10 7:6.3.7.9.dfsg1-2 image manipulation library
ii libsm6 2:1.0.3-1+b1 X11 Session Management library
ii libtiff4 3.8.2-7 Tag Image File Format (TIFF) libra
ii libx11-6 2:1.0.3-7 X11 client-side library
ii libxext6 2:1.0.4-1 X11 miscellaneous extension librar
ii libxt6 1:1.0.5-3 X11 toolkit intrinsics library
ii zlib1g 1:1.2.3.3.dfsg-11 compression library - runtime
imagemagick recommends no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
Package: imagemagick
Version: 7:6.3.7.9.dfsg2-1+b1
Closed upstream using png8 format.
Regards bastien
--
"ROUCARIÃS Bastien"
[email protected]
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--- End Message ---
