On 8/20/07, Robin Schwab contact@robinschwab.ch wrote: [snip]
Exif information is not altered when uploading. Exif date/time original is not altered when edititing in Photoshop.
This brings us back to an old issue as well.. right now EXIF data isn't copied into thumbnails. This is annoying because our thumbs lose all this nice data.
It would also be useful if we added 'thumbnailed flag' and a link to the wikimedia image to the EXIF of thumbs that we generate. This would make detection of uploading images derived from our thumbnails much easier.
It would be even better to also copy the entire text of the image page, but just the URL would be a big improvement.
We don't copy the EXIF today for good reason: some jpegs have huge blobs of data stuffed into the jpegs. A complete matrix+shaper ICC profile is much larger than most of our thumbs. There are also thumbs in the EXIF of a lot of images.
Has anyone seen any written recommendations on exif data that should stripped for thumbnails?
On 20/08/07, Gregory Maxwell gmaxwell@gmail.com wrote:
We don't copy the EXIF today for good reason: some jpegs have huge blobs of data stuffed into the jpegs. A complete matrix+shaper ICC profile is much larger than most of our thumbs. There are also thumbs in the EXIF of a lot of images.
I was about to say just this - the [[:en:Casio Exilim]] throws about 30KB of crap into the EXIF of every photo.
Has anyone seen any written recommendations on exif data that should stripped for thumbnails?
The trouble with EXIF is that it's not actually a maintained standard, just more of a tacit agreement between camera manufacturers. (And some play fast and loose even then, notably Canon.)
We could put a cut-down set of EXIF data into thumbnails, and since we can regenerate these from the original any time we like it shouldn't permanently lose data if we realise there's a field we could really do including with after all. Note that I'm not making suggestions here for what data to include ...
- d.