Francesco Romani wrote:
On 7/3/07, Claude Heiland-Allen <[EMAIL PROTECTED]> wrote:
I have a large number (46650) of image files that I thought I would use
transcode to convert to DVD MPEG2, seeing that it has an mpeg2enc back
end.
But, the output is really really ugly - it seems the chroma subsampling
is spatially aliased, so my 1-pixel lines flicker between colour and
grey in a very wrong way:
[...]
Dunno yet if this is an ImageMagick issue, an import_im glitch or a
transcode core misbehaviour... Which version of ImageMagick and
transcode are you using?
(~) # transcode --version
transcode v1.0.2 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg
(~) # convert -version
Version: ImageMagick 6.2.3 06/09/05 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2005 ImageMagick Studio LLC
FWIW, I used the --use-rgb flag to transcode, because it complained
otherwise. I lost the exact command line I tried, sorry.
[...]
(good) lossless TIFF images -> ppm -> ppmtoy4m -> mpeg2enc -> MPEG2
is vastly superior to:
(bad) lossless TIFF images -> transcode -> mpeg2enc -> MPEG2
Any thoughts?
Feeding transcode with images converted to ppm leads to bad result as well?
Haven't tried yet, will test in a few days when I have time...
Claude
