Re: Image file name extension not recognized

[Vinicius Jose Latorre <viniciusjl@ig.com.br>]

Vinicius Jose Latorre wrote:
> Chong Yidong wrote:
>> Vinicius Jose Latorre <viniciusjl@ig.com.br> writes:
>>
>>  
>>> I have some image files with names like:
>>>
>>>    IMG_0366.JPG
>>>
>>> When I try to open it, Emacs does not recognize it as an image file.
>>>
>>> But if I rename the file to:
>>>
>>>    IMG_0366.jpg
>>>
>>> Then Emacs recognizes the file as an image file.
>>>
>>> Shouldn't Emacs recognize files with .JPG extension as an image file?
>>>     
>>
>> Jpeg images are supposed to be autodetected using their contents, even
>> if the file extension is JPG (see image-type-header-regexps).
>> Apparently, that autodetection is failing in this case.  Could you try
>> to find out why?
>
> The image-type-header-regexps variable has the value:
>
>  '(("\\`/[\t\n\r ]*\\*.*XPM.\\*/" . xpm)
>    ("\\`P[1-6]" . pbm)
>    ("\\`GIF8" . gif)
>    ("\\`\211PNG\r\n" . png)
>    ("\\`[\t\n\r ]*#define" . xbm)
>    ("\\`\\(MM\0\\*\\|II\\*\0\\)" . tiff)
>    ("\\`[\t\n\r ]*%!PS" . postscript)
>    ("\\`\xff\xd8" . (image-jpeg-p . jpeg)))
>
> Where image-jpeg-p is a function.
>
> I just type  M-x debug-on-entry RET image-jpeg-p RET
>
> Then tried to open the file again and image-jpeg-p is not called.

Hummm, very interesting, if I rename the extension file to .jpg 
extension, then image-jpeg-p is called.