Custom Exif Tags
exif
Solution
From http://www.exif.org/Exif2-2.PDF:
D. Tags Relating to User Information MakerNote A tag for manufacturers of Exif writers to record any desired information. The contents are up to the manufacturer, but this tag should not be used for any other than its intended purpose. Tag = 37500 (927C.H) Type = UNDEFINED Count = Any Default = none
UserComment A tag for Exif users to write keywords or comments on the image besides those in ImageDescription, and without the character code limitations of the ImageDescription tag. Tag = 37510 (9286.H) Type = UNDEFINED Count = Any Default = none
exiv2 supports `MakerNote` tags: http://dev.exiv2.org/projects/exiv2/wiki/How_to_add_support_for_a_new_makernote
If you don't want to do this, you can use `UserComment`: http://www.exiv2.org/doc/exifcomment_8cpp-example.html
Problem
I am using exiv2 to manipulate metadata in a jpeg file. I need to write more information related to image processing into the metadata. Is is possible to create Custom Exif tags other than the standard ones?