Re: [Gimp-user] Corrupted JPEG

[Partha Bagchi <partha1b gmail com>]

Phil,

I doubt that you can do much with these images other than extract the
thumbnail which is obviously quite small.

I used jpeg snoop (http://www.impulseadventure.com/photo/jpeg-snoop.html)
to examine file number 4 and there are markers in the file that should not
be there. Perhaps you can use a hex editor to fix it, I have no idea.

Sorry,
Partha



On Sat, Jan 4, 2014 at 7:23 PM, Phil <skeggy78 gmail com> wrote:

> Hi Partha/all
>
> Ive uploaded/shared 4 pics to dropbox...
>
> 0001 is ok
> 0002 is 75% is ok
> 0003 is 5% ish ok
> 0007 is just another 5% ok file
>
> looking though the thumbnails more closely, even some of them seem to have
> corruption, ie pink lines though them, that look to be old ascii symbols,
> but cant see that clearly, as they thumbs.
>
> Ill try the Exif extraction tool in a bit, just to try and get something
> at least out of the pictures.
>
> https://www.dropbox.com/sh/dp0nsvn1jn9sons/E6Erp9vJP-
>
>
> Cheers
> Phil
>
> On 05/01/2014 00:09, Partha Bagchi wrote:
>
> > Can you post an example of your corrupted jpeg file?
> >
> >
> > On Sat, Jan 4, 2014 at 4:53 PM, Elle Stone
> > <ellestone ninedegreesbelow com>wrote:
> >
> >  On 01/04/2014 04:27 PM, Phil wrote:
> > >  Hi All
> > > > Apologies to all for not starting a new thread, i have been an avid
> > > > reader of the emails for a while now, and read most of what people put
> > > > here, so sorry Michael & Jay who pointed that out to me..
> > > >
> > > > ill try and answer all questions about whats what etc.
> > > >
> > > > I believe the original pictures, that were taken in 2011, were taken
> > > > directly of the camera via USB cable, these were then stored on my
> > > > friends computer, and these were corrupted. I didnt notice it much at
> > > > first, as she asked me to look at something different (spamware), but
> > > > her screen saver, which must have read the pic folder, showed pictures,
> > > > that looked to be corrupted, i initially thought that these were to big
> > > > for the screen saver to handle, and dismissed them.
> > > >
> > > > She still had the memory card, and the thumbnails, still showed fine on
> > > > camera preview screen, so she thought they were safe. But luckly, she is
> > > > not an avid photographer, and didnt even wipe the card! After that, i
> > > > Borrowed the card, and used photorescue (it saved me once so i was more
> > > > than happy to pay for it after my canon 350d corrupted a card that was
> > > > not quick enough), and it again found the same pictures corrupted.
> > > >
> > > > So then began my quest for finding information/utilities to undo/correct
> > > > the files.
> > > >
> > > > The Card reader is my own, that i ran the software recovery on, so with
> > > > the fact that since she has bought a new memory card, and it worked
> > > > fine,  i assume its a faulty card? so i took a copy of what she had.
> > > >
> > > > DSC0001.jpg seems to be fine, this is the first card picture on the
> > > > card, i dont know if any were taken before, ie new card or new camera,
> > > > but i could find out if needed. DSC0002.jpg, that is ooo 75% ok, but
> > > > after that, all the remaining 221 pictures are damaged, all only showing
> > > > about 5%.
> > > >
> > > > I ran imagemagick "mogrify -strip name-of-file.jpg", that ella
> > > > suggested, and it gave me a comment unsupported marker type 0x3a
> > > > 'dsc0002.jpg' @warning/jpeg.c/jpegerrorhandler/313.
> > > >
> > > > I did try loading into Gimp 2.8.2 on debian 7.2 after the imagemagick
> > > > command, and it also said this message (i thought i had tried it on
> > > > linux but obviously not), OSX 10.6 running gimp 2.8.3 didnt give the
> > > > same error message, and im sure windows 7 running gimp 2.8.6 (from
> > > > memory) also didnt give the handler error.
> > > >
> > > >   From what little research that i have done since, the error is quite a
> > > > complicated one. Something to do with data strips ending in FF D9 in a
> > > > hex editor. The 0001 file has 3 of these, the other 2 that i have tried
> > > > only have 1 reference (from searching the file).
> > > >
> > > > Ella's other suggestion for converting from jpg to png, i entered
> > > > "convert DSC0002.jpg test.png" and it converted the image, with the
> > > > corruption, with no error's reported, also tried dsc0001 and it
> > > > converted fine (but the original image was ok).
> > > >
> > > > Im assuming meta data is not transfered to a PNG, ill be honest, i dont
> > > > know much about them, as most of my work is saved back out as JPEG's
> > > > etc, apart from when exporting from inkscape, which prefers PNG's/Tiffs
> > > > etc.
> > > >
> > > >
> > > >  Hmm, well, it does sound like file damage rather than just a case of
> > > messed up metadata or a version of jpeg that imagemagick can read and
> > > other
> > > image editors can't. Perhaps someone else can help. I don't know anything
> > > at all about recovering damaged image files.
> > >
> > > If the thumbs are intact, this page:
> > > http://ninedegreesbelow.com/photography/exiftool-commands.html#extract
> > > tells how to use exiftool to extract the thumbnail as a separate image
> > > file. As always, work on a copy of the original.
> > >
> > > Good luck!
> > >
> > > Elle
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