On Sat, Oct 23, 2010 at 11:27 AM, Frank Gore g...@projectpontiac.comwrote:
On Sat, Oct 23, 2010 at 2:11 PM, Mark Phillips
m...@phillipsmarketing.biz wrote:
My apologies for this OT post, but I need some help from an image
expert,
and I thought the Gimp list might have one or two.
When I upload images from a friend's digital camera, a Java web app is
not
able to create thumbnails (they appear black with the title of the image
in
the image area). However, clicking on the missing thumbnail renders the
full
image. When I upload images from a different camera, the same app
generates
the thumbnail and also renders the full image. Is there a special setting
that camera's have to have set to allow thumbnails to be created? Both
file
types are jpeg. I am not seeing any error messages from the app.
Yep, definitely off-topic :p
Those applications you mentioned probably aren't generating
thumbnails. They're just using the existing thumbnail that's embedded
in the file. Most cameras embed a thumbnail in the JPG file, some do
not. Your friend's camera probably just doesn't have those thumbnails
embedded.
I tested a bad image and a good image using Jeffrey's Exif viewer (
http://regex.info/exif.cgi), and both images had an embedded thumbnail. The
only difference I saw in the two files from the two cameras was that the
image from the bad camera had this warning;thumbnail size does not match
image size. The image size from the bad camera was 5,184 × 3,456 and the
thumbnail was 160 X 120. I think this warning is referring to aspect ratio.
Anyway, I could not see any difference in the data from both pictures, but
then I am not an image expert.
To keep this on-topic: Gimp and most other image editors have an
option to include a thumbnail when saving a JPG file. I typically
disable this option for web graphics to make the file size smaller.
--
Frank Gore
THE place to talk photography!
www.friendlyphotozone.com
___
Gimp-user mailing list
Gimp-user@lists.XCF.Berkeley.EDU
https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
