I hope the list is now running again:
I meet troubles encoding digital photographs to grayscale JPEGs with IM.
The result of
convert photo.jpg -type grayscale photo_sw.jpg
works fine with most programs, but not with Adobe FrameMaker. Trying to
find out about the reason, I read the information from the resulting JPEGs:
identify -verbose photo_sw.jpg
which yields (besides a bunch of other lines):
JPEG-Colorspace: 1
JPEG-Sampling-factors: 2x1
The color subsampling does not make sense (as far as I can see) as this
is a grayscale image, which is indicated by "colorspace 1". Most
programs therefore ignore this entry and display these JPEGs correctly.
FrameMaker doesn't.
Is this to be considered as a bug? Is there any workaround? These
problems just occur when I have digital photographs a the source for
convert.
Wolfgang Hugemann
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