yellowish color with resize and -pix_fmt pal8

[ami_stuff]

not reproducible with -pix_fmt bgr24

C:\>ffmpeg -i 1023.bmp -s 1024x767 -pix_fmt pal8 out.bmp
ffmpeg version N-40172-g28c5775 Copyright (c) 2000-2012 the FFmpeg developers
  built on Apr 28 2012 02:21:26 with gcc 4.5.0 20100414 (Fedora MinGW 4.5.0-1.fc
14)
  configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch=
x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686-pc-min
gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-cpudetect
--enable-cross-compile --enable-static --disable-shared --extra-libs='-lws2_32 -
lwinmm' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapshots/buil
d/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/snapshots/b
uild/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-version3 --enable-n
onfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-libopencor
e-amrwb --enable-libmp3lame --enable-libvpx --disable-decoder=libvpx
  libavutil      51. 48.100 / 51. 48.100
  libavcodec     54. 16.100 / 54. 16.100
  libavformat    54.  3.100 / 54.  3.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 72.100 /  2. 72.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 11.100 /  0. 11.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, image2, from '1023.bmp':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: bmp, pal8, 1023x767, 25 tbr, 25 tbn, 25 tbc
[buffer @ 0x1dc1fc0] w:1023 h:767 pixfmt:pal8 tb:1/1000000 sar:0/1 sws_param:fla
gs=2
[scale @ 0x1dc2180] w:1023 h:767 fmt:pal8 sar:0/1 -> w:1024 h:767 fmt:pal8 sar:0
/1 flags:0x4
Output #0, image2, to 'out.bmp':
  Metadata:
    encoder         : Lavf54.3.100
    Stream #0:0: Video: bmp, pal8, 1024x767, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (bmp -> bmp)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.04 bitrate=   0.0kbits/
s
video:768kB audio:0kB global headers:0kB muxing overhead -100.000000%

[cehoyos]

The md5sum for out.bmp is identical for 0.11, 1.0 and current git head: 9f7c293e0940a372c6d897d769b110d4

ffplay out.bmp -fs shows no yellowish colour, several other display methods (gimp, xv, ImageMagick?, ffplay without -fs) show some distortion.

[richardpl]

Input palette is black and white only, while output rgb24 pam/bmp is not any more black and white only.

[cehoyos]

Replying to richardpl:

Input palette is black and white only, while output rgb24 pam/bmp is not any more black and white only.

Could you elaborate? The sample command line only produces pal8 output.

[richardpl]

Sorry, it also happens when going from pal8->pal8. Just add logs to dump palette entries to lavc/bmp.c