[Digikam-devel] [Bug 130525] Saving large (>5M) jpg's result in corrupt file

[Duncan Hill]

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http://bugs.kde.org/show_bug.cgi?id=130525         




------- Additional Comments From kdebugs nacnud force9 co uk  2006-07-12 15:38 -------
If I start with a 2.3 MB JPEG source, resize to 50% and re-save to a 385KB JPEG, the resulting JPEG is intact.

If I start with a 8.8 MB RAW file, and save to PNG, I get a 27 MB file with no tags at all (EXIF, Makernote or ITPC), but it's fine other than Exiv2 not liking it (digikam: Cannot load metadata using Exiv2 (/home/dhill/Images/2006/2006-07-10/z.png: The file contains data of an unknown image type))

If I start with a 8.8 MB RAW file, and save to JPEG with no changes, I get a 781 KB JPEG that's intact.

If I start with a -different- 8.8 MB RAW file, and save to JPEG with no changes, I get a corrupt JPEG.  If I resize to 50% I get a corrupt JPEG.

The correlation between corrupt and not corrupt appears to be the 'density' of colour data in an image.  The image that produces good JPEGs when saved is just a bowl of food.  The image that produces bad JPEGs when saved is a big yellow truck.

Resources to help test:
http://www.cricalix.net/~dhill/digikam/good_src.raw
http://www.cricalix.net/~dhill/digikam/good_src.jpg
http://www.cricalix.net/~dhill/digikam/bad_src.raw
http://www.cricalix.net/~dhill/digikam/bad_src.jpg