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bug#10112: ImageMagick doesn't display some image formats

From: Juri Linkov
Subject: bug#10112: ImageMagick doesn't display some image formats
Date: Fri, 25 Nov 2011 00:49:37 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.91 (x86_64-pc-linux-gnu)

>>  E.g., I have to explicitly
>> (add-to-list 'image-type-header-regexps '("\\`\377\330" . imagemagick))
>> to have image-mode use imagemagick to display a jpeg file.
> Sorry, this seems to be another problem...

Yes, this is another problem.  Gnus doesn't use `image-type-header-regexps'.
mm-decode.el creates an image by calling `create-image' with `imagemagick'
and `data-p' arguments, so `image-type' doesn't call `image-type-from-data'.

But this is still a problem.  Currently we can't view images supported
by ImageMagick when they are visited from archives.  That's because of
the problem you mentioned: there are no ImageMagick headers in

Another problem is that we can't use ImageMagick transformations on
default image types JPEG, GIF, PNG because they are not visited
with the help of ImageMagick.

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