[Digikam-devel] Re: Exif properties

[Marcel Wiesweg]

>  Hello, i  am currently working on GSOC project entitled  "Metadata
> writeback" , where i focus on writing any metadata changes in nepomuk to
> the file itself if its possible. for images (that too Exif) specific i am
> using Exiv2 library to write the metadata changes but since there are
> numerous tags/properties in Exif , i am looking for the once that are
> likely to be changed as such , since its unlikely that exposure or focus
> time will ever be changed,
> 
>   So i ask can you please list out all the exif properties which are likely
> to be changed as most exif properties would never be changed hence there is
> no need to write the metadata changes back to file for those properties as
> such ?

I would recommend to read through libkexiv2. You will see that there are a 
selected few methods to write attributes. These methods will typically write 
not only to Exif, but IPTC and XMP as well and are good candidates for your 
search.