[CREATE] XMP : MakerNote

[Jon Phillips]

On Fri, 2007-06-08 at 00:01 +0200, Cyrille Berger wrote:
> Hello,
> 
> I am currently working on XMP for Krita, and Gilles Caullier has told me that 
> one problem with XMP for photograph is that it can't serialize Makernote 
> (small binary chunks inside exif which can be used to manufacturers to extend 
> the exif specification to include more information). And searching in google 
> for XMP and Makernote, you can see that quiet a lot of people are complaining 
> about that.
> The problem about those Makernote is the unavailability of their 
> specification, some effort has been made to reverse engineered them (a 
> summary of the effort is available at exiv2 website: 
> http://www.exiv2.org/makernote.html), but the result is far to be exhaustive, 
> so there is need to keep the old makernote data chunk with the hope, that in 
> the future more information can be exctracted from it (and anyway it's needed 
> to save back to exif).
> 
> So I propose, one schema for the data chunk:
> uri: http://create.freedesktop.org/xmp/MakerNote/1.0
> prefix: mkn
> 
> With only value:
> 
> RawData as a String with the MakerNote encoded in base64
> 
> Then as many schema as specification, with an uri of the form 
> http://create.freedesktop.org/xmp/MakerNote/MANUFACTURER/VERSION
> 
> For instance, for Canon (http://www.burren.cx/david/canon.html)
> http://create.freedesktop.org/xmp/MakerNote/Canon/1.0
> 
> With tags beeing:
> ImageType as string
> FirmwareVersion as string
> ImageNumber as integer
> OwnerName as string
> CameraSerialNumber as integer
> MacroMode as boolean
> Quality as choice
> FlashMode as choice
> ...
> 
> What do you think ?

It sounds all good to me...Hubert and others, what do you think?

Jon

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Jon Phillips

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