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Re: image-dired does not rotate the original image
From: |
Thien-Thi Nguyen |
Subject: |
Re: image-dired does not rotate the original image |
Date: |
Sun, 22 Jul 2007 19:01:52 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.1.50 (gnu/linux) |
() "Mathias Dahl" <mathias.dahl@gmail.com>
() Sun, 22 Jul 2007 15:52:16 +0200
As I mentioned earlier, jpegtran does lossless rotation, something
`convert' cannot do (or could not the last time I checked).
does this limitation also exist w/ mogrify(1) (or alternatively gm(1)
subcommand mogrify)? i suppose to check for loss one could use:
cp foo.jpg foo.orig.jpg
gm mogrify -rotate -90 foo.jpg
gm mogrify -rotate 90 foo.jpg
cmp foo.jpg foo.orig.jpg
however, doing the above (even w/ "-quality 100" for the mogrify commands)
always results in cmp(1) noting a difference, even though visually i could
not tell. i'm not a graphics format expert; could you suggest a better
way to check for loss?
thi