On Sat, Oct 23, 2010 at 11:27 AM, Frank Gore <[email protected]>wrote:
> On Sat, Oct 23, 2010 at 2:11 PM, Mark Phillips > <[email protected]> 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 >
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