XMP packets are much smaller than the image data. I've never seen a real case where that's not the case. Wait with compression until it solves a real problem.
Lars
There's support for zipped string attributes in a feature branch at github, and should make it into an upcoming official release.
If the data gets quite big, maybe the XMP attribute could be a zipped string. This keeps down file size, but also helps read speed and memory usage, since the zipped strings are not uncompressed until the contents of the string are queried. On 18/07/13 11:12, Larry Gritz wrote:
+1
As XMP, it's just an ordinary string (though potentially a big one) and the naming conventions are already decided by others. Though it does beg the question of a portable, compact, nicely licensed parser for XMP. (I rolled my own but am not especially
happy about it. Does anybody have a good recommendation?)
As an alternative, what I do in OIIO when saving EXIF data into OpenEXR files is simply to name it all "Exif:Foo" or "IPTC:Foo", with Foo being the official Exif or IPTC names, and the prefix making it pretty easy to distinguish from ordinary exr user
metadata.
On Jul 17, 2013, at 10:09 AM, Lars Borg wrote: Thomas,
Why not use XMP instead? XMP includes all of EXIF + Dublin Core ++
Lars
Hi,
I'm resurrecting that thread after 7 years, I basically wanted to know if there has been more discussions about that matter in the recent years.
The fact there is no standard attributes for common camera data prevents a bit the format to be used as a solid input container for photo processing applications or anything relying on EXIF data. For instance if you want to stitch EXR files with PTGui
you will have to enter your data manually.
I think it would be really important trying to establishing a standard list of attributes as suggested by Thomas Lock, the exrstdattr already provides a list of them, maybe completing / updating this one?
Cheers,
Thomas
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