hello,
On Wed, Jul 21, 2004 at 03:51:10PM +1200, Joseph Heled wrote:

(I hope this is the appropriate forum ...)

((this should be a fine forum for these questions))

I would like to "attach" to the image some of the parameters of the conversion.
I am not sure ,
- How do I add this info to the image (I open it with gimp_image_new(...) )

when you save the image, there is a comment parameter for the file formats which have comments.

- Which file formats support this kind of comment/data?

png and jpeg. /Xtns/DB Browser will be useful to you. there are other parameters than comments to worry about while scripting TheGIMP.

also, the png comments were only recently added so use file-save-png2.

i have a script that writes a text file to each image and also writes the image number and location on my computer of each image. handy stuff. back in the old days, we used to have to mark each image by hand and wait for the ink to dry before moving onto the next image.

there might be other formats. i recommend png as it is a lossless format and really nice and free.

good luch and happy gimping,

carol

Hi,

Joseph Heled wrote:

I would like to "attach" to the image some of the parameters of the conversion.

The GIMP uses a mechanism we call parasites to attach data to an image. A good example of their use is in the jpg plug-in, for example, where we attach exif data, a comment and also save parameters. A complete list of "standard" parasites, and a short description of teh parasite mechanism, is in devel-docs in the GIMP sources.

I am not sure ,
- How do I add this info to the image (I open it with gimp_image_new(...) )
- Which file formats support this kind of comment/data?

png, tiff, jpg all support exif, iptc is supported by tiff and jpeg as well, there are lots of other metadata formats which are supported by various formats. I'm not quite sure.

On a related issue, how can I add EXIF data to the image? Perhaps I can add some
data in the EXIF comment?

We link to libexif already, and use it in the jpeg plug-in. You can construct an exif header and write it to a file in the same way as we write the exif header back to the file now.

libexif is available here: http://sourceforge.net/projects/libexif

Cheers, Dave.

Joseph Heled writes:

It turned out to be as simple as attaching a "gimp-comment" and "jpeg-exif-data" parasites to the image.

Note that in Gimp 2.1 the exif data parasite has been renamed "exif-data", because it is not specific to jpeg files.

Best, -- Bill

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