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preview stored in jpeg?

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preview stored in jpeg? Milos Prudek 20 Nov 22:27
  preview stored in jpeg? Michael Schumacher 20 Nov 22:58
  preview stored in jpeg? Sven Neumann 20 Nov 22:59
   preview stored in jpeg? Milos Prudek 21 Nov 11:31
Milos Prudek
2004-11-20 22:27:54 UTC (about 20 years ago)

preview stored in jpeg?

Can jpeg image created by Gimp contain a small preview of the image, different than the image itself, specifically an older version of the image?

I'm out of possible explanations: if you go to http://www.photoserver.cz/user.asp?IDENT=367 and look at the thumbnail image in the top left corner called "s jeziskem", you'll see the bright window on the right. This is unprocessed image. It was never send to the photoserver.

When you click on the thumbnail you will see the full size image, cropped and processed.

How could the unprocessed image have been obtained by the webserver? I do not understand this. The unprocessed image has a totally different filename than the processed image... and more importantly, the upload dialog of the webserver does NOT allow an upload of a thumbnail. You can only upload one image in the webserver's upload form, and it is of course the full size image, and the server is responsible for thumbnail generation.

Michael Schumacher
2004-11-20 22:58:40 UTC (about 20 years ago)

preview stored in jpeg?

Milos Prudek wrote:

Can jpeg image created by Gimp contain a small preview of the image, different than the image itself, specifically an older version of the image?

Yes.

How could the unprocessed image have been obtained by the webserver?

If the preview was part of the EXIF data, then it has been preserved by GIMP. The thumbnail creator at the webserver then used it a thumbnail.

Current versions of GIMP (2.2-pre2 and up) load and store the EXIF thumbnail of JPEG files.

HTH,
Michael

Sven Neumann
2004-11-20 22:59:35 UTC (about 20 years ago)

preview stored in jpeg?

Hi,

Milos Prudek writes:

Can jpeg image created by Gimp contain a small preview of the image, different than the image itself, specifically an older version of the image?

Yes. GIMP 2.0 does keep the EXIF info w/o altering it. That EXIF info can contain a thumbnail image. If you edit the JPEG file with GIMP 2.0 it will not change the thumbnail image.

This has changed with GIMP 2.2-pre2 which now does take care of updating the thumbnail so that it represents the full-sized image.

Sven

Milos Prudek
2004-11-21 11:31:48 UTC (about 20 years ago)

preview stored in jpeg?

> Yes. GIMP 2.0 does keep the EXIF info w/o altering it. That EXIF info > can contain a thumbnail image. If you edit the JPEG file with GIMP 2.0 > it will not change the thumbnail image.

Thanks for the info!