Re: [Openexr-devel] EXIF meta data attributes in headers

[Larry Gritz]

One potential problem is: if you treat the XMP as a black box that just gets 
copied to the output, it's easy for it to get "out of sync" with the actual 
image or with other OpenEXR fields that hold redundant versions of the data.

For example: there are standard EXR attributes for a few things that would be 
in XMP, like expTime, aperture, or capTime. Others arguably are replicated: is 
"owner" the same as the XMP copyright notices, or not?

If you think any of these are supposed to represent the same data, you can get 
into problems when an app reads the EXR file, just copies XMP to output, but 
changes one of the related OpenEXR fields. Then you end up with an output file 
that has metadata that in some sense contradicts itself.

        -- lg


On Jul 18, 2013, at 2:51 PM, Piotr Stanczyk wrote:

> Am I right in thinking that the primary need here is to be able to carry the 
> EXIF data through a pipeline that uses OpenEXR images so as to preserve for 
> ingest in other places?  (rather than wanting to duplicate the EXIF tags as 
> separate attributes within the header?)
> 
> 
> - Piotr
> 
> ________________________________________
> From: address@hidden address@hidden on behalf of Brendan Bolles address@hidden
> Sent: 18 July 2013 13:51
> To: address@hidden
> Subject: Re: [Openexr-devel] EXIF meta data attributes in headers
> 
> On Jul 18, 2013, at 11:32 AM, Lars Borg wrote:
> 
>> Such questions are easily answered by Wikipedia :-)
>> On this list, Adobe makes only 7 out of 50 that openly support XMP.
> 
> 
> Wikipedia?  What's that?  ;)
> 
> OK, but how about for programs that intersect with the users of OpenEXR?  
> Where's DaVinci, Lustre, Smoke, Nuke, etc.?
> 
> Anyway, yes let's make XMP a standard attribute and then I'll immediately 
> support it with my OpenEXR plug-ins for the Adobe apps.
> 
> Is there anyone who would prefer EXIF binary data?
> 
> Can we get an ICC Profile attribute added while we're at it?
> 
> 
> Brendan
> 
> 
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--
Larry Gritz
address@hidden