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

[Alan W. Irwin]

On 2007-05-24 10:23-0700 R. Langkamer wrote:

> On 5/24/07 9:57 AM, Murray Strome wrote:
>
>> Hi Alan,
>> 
>> Thanks. I am going to have her send the photos using the Mac iPhoto system 
>> with the "Large" option selected to see what happens.  She had sent them 
>> just as they were saved into her Mac from her digital camera.  In the EXIF 
>> data under comments it has "AppleMark", whatever that might mean.
>> 
>> Murray
>
>
> 	One report on the web indicates that "applemark" is juts a caption 
> placed in the caption field of the image metadata. I suspect a corrupt image 
> file. If the other user sent it to you as is from the camera, then the only 
> other culprit would be receiving the image via email. Email is not a safe way 
> to transfer files. Have them send it to you again but zipped up instead. I 
> have not experienced any problems in working with images direct from my 
> olympus camera or from copies exported from iPhoto.

I agree image corruption is probably an even better possibility to explain
this.  I have had some recent experience with Mac OS X attachment corruption
(an ascii patch file attachment had all the line endings changed to the
windows (!) variant from one of my developer correspondents who uses an
Apple system). Such "smart" transformations of attachments are really dumb
in my opinion.

I agree you can probably beat that by compressing the file (which either Mac
OS X will recognize as not being worth further transformation or which it
classifies as an arbitrary binary file so it won't do anything "smart" with
it).

If you can view the image on the Apple computer, but not on your own
computer, then do an md5sum on the file for both systems to make sure you
have an identical file.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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