[Discuss] Peculiar JPEG Image behaviour -- Off Topic?

[R. Langkamer]

On 5/24/07 8:23 AM, Murray Strome wrote:

> i received three JPEG images in full resolution sent by someone with a 
> Mac computer. They were all "full resolution", and a bit over 2 MB is 
> size.  I tried to open them with the GIMP (2.2).  In one case, it took 
> about 30 minutes to open. On the lower bar, it said the background was 
> about 900MB.  During the opening of the image, the computer pretty well 
> ground to a halt. I did some editing and tried to save it again, but 
> after an hour of churning away, using 85% of the computer's 1GB RAM, it 
> still wasn't saved and I was really unable to do anything else with the 
> computer because the response was so slow, so I killed the application.  
> I was able to open it using Gwenview, then save it, then open it with 
> the GIMP. It was still pretty big, so I created a new file, copied and 
> pasted the image I had opened with the GIMP into it, then  saved it.  
> That image opened OK.
> One of the images gave this error when trying to open it in the GIMP:
> 
> Opening '/tmp/P5010021.JPG' failed: Plug-In could not open image
> 
> I found I could upload the image to Google's Picasa2 with no problem. I 
> downloaded the image from the website, tried to open it with the GIMP 
> and had the same problem. I can preview it OK, and the EXIF data under 
> properties all looks OK. There must be something about the JPEG format 
> full resolution images are saved with the Mac to cause this (I think).
> 
> I found the same problem when I tried to open it with the GIMP in Windows.
> 
> Does anyone have any idea as to what is going on?  I have never seen 
> anything like this before.
> 
> Murray


	Based on the additional information I found at this URI :

http://bugs.php.net/20560

	I would surmise that you attempted to open the thumbnail file as 
AppleMark typically appears in the header of thumbnail images made in 
MacOS X. Otherwise, the image is an Apple PICT file according to this URI :

http://www.computerbuddies.us/what_is_a_jpg.htm

	That being said, if the image you opened was in fact direct from the 
camera, then I would say that the email transmission corrupted the image 
possibly and thusly you are experiencing problems decoding it in gimp.

	One final bit of important information, how many files appeared in your 
email from the sender? Of these attachments, which did you attempt to open?

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