Re: unable to open jpg file

[Jason Rumney <jasonr@gnu.org>]

YAMAMOTO Mitsuharu wrote:
> As image-jpeg-p returns nil for that image data (no "JFIF" or "Exif"
> as a substring), it couldn't be displayed even with the X11 version,
> either.  As this is not Carbon-specific, I would like to leave the
> issue to those who are more familiar with image.el and/or image format
> spec.
>   

I found some more work friendly non-JFIF/Exif JPEG images here:

http://www.marysvilletourism.com/media/index.htm

Firefox and Emacs 22 fail to display these images, but Emacs trunk 
displays them (is this the case with the images in the original report?).

The difference between Emacs 22 and trunk seems to be in the function 
image-type. In Emacs 22, if the image headers do not determine the type, 
we convert the file extension to a symbol and use that. This means .jpg 
files are given a type of 'jpg, which is not the correct image-type for 
jpeg images.

The trunk has been changed to use image-type-from-file-name instead, 
which correctly returns 'jpeg for that image.

I have backported that change to emacs-22.