[dokuwiki] Metadata editor for Images (JPEG only)

Hi all!

I just finished the metadata editor. This is the counterpart to the image 
detail page added recently. All JPEG images now have a little pen icon in the 
media popup. Selecting it opens the metaeditor. The fields it shows are defined 
in tpl/default/mediaedit.php

As you can see (if you take a look at this template) it tries to load it's 
values from multiple fields but only saves to one IPTC field. This may make 
trouble and it may be better to delete the other fields on saving but I don't 
know yet...

I'm not sure how compatible it is. I haven't done any tests with other software 
yet. I'd like to get some experiences from you. Can you read the info saved 
with DokuWiki with your favourite image tool?

I know there are ways to save metadata in PNG and GIF but I don't know how. If 
anyone can extend the JpegMeta class to read and write this data I'd be happy 
to hear. Any pointers to libraries to do so are welcome, too.

Andi

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