Bug#564111: gimp-dds: Dark 1x1 mipmap for 2D texture
michalis.kambi at gmail.com
Thu Jan 7 19:03:28 UTC 2010
Open this file
and save as DDS, checking "Generate mipmaps" (everything else default).
Look at mipmaps in the resulting file (e.g. open saved file back by
gimp-dds). The lowest 1x1 mipmap contains one almost black (color is
Which is wrong --- the base image is obviously mostly white, so the
final 1x1 mipmap should be much lighter. Also, all the colors on
previous 2x2 mipmap are much *lighter* than #1d1c1c.
So something went wrong when generating (at least) this mipmap level.
Not sure whether 2x2 level is 100% correct either (it's a little too
dark anyway, although not as black).
My resulting DDS file is on
I also tried selecting both mipmaps and DXT1 compression, result is here:
Result with S3TC compression has the same problem, so this
problem is not related to S3TC.
Oh, and I tested reading these DDS files with my own programs, and yes,
the last mipmap level *is* almost black. So it's not a problem in DDS
reader --- trouble happens at DDS writing, when mipmaps are generated.
I initially saw both problems with 2.0.7 (more precisely, 2.0.7-1
version of Debian package "gimp-dds"). I checked out and compiled trunk
(from http://nifelheim.dyndns.org/svn/gimp-dds/trunk ) and both bugs are
still there. (I don't see any changes in SVN since around the 2.0.7
My gimp version is 2.6.7-1.1.
Submitted by email to upsteam author (mail at the bottom of
http://nifelheim.dyndns.org/~cocidius/dds/), without an answer,
so resubmitting to Debian hoping for a fix :)
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.26-2-686 (SMP w/2 CPU cores)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages gimp-dds depends on:
ii libc6 2.10.2-2 GNU C Library: Shared libraries
ii libgimp2.0 2.6.7-1.1 Libraries for the GNU Image Manipu
ii libglib2.0-0 2.22.3-1 The GLib library of C routines
ii libgtk2.0-0 2.18.3-1 The GTK+ graphical user interface
gimp-dds recommends no packages.
gimp-dds suggests no packages.
-- no debconf information
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