Usually, it is enough to reset the Exif.Image.Orientation and
Xmp.tiff.Orientation tags to neutralize the orientation of an image.
However, some cameras may use non-standard tags. In such cases, merely
setting the standard tags will make the metadata inconsistent. Hence,
it is better to use gexiv2_metadata_set_orientation because it will
take care of the non-standard tags.
with proper value names. Mark most values as _BROKEN because they use
weird alpha compositing that has to die. Move GimpLayerModeEffects to
libgimpbase, deprecate it, and set it as compat enum for GimpLayerMode.
Add the GimpLayerModeEffects values as compat constants to script-fu
and pygimp.
Some refactoring: add gimp_metadata_get,set_colorspace() and a new
enum GimpMetadataColorspace which so far can be one of { UNSPECIFIED,
UNCALIBRATED, SRGB, ADOBERGB }. The setter is untested and I don't
know if it's doing the right thing, please review. Use the getter in
gimp_image_metadata_load_finish(), so complex metadata logic and
profile creation/setting are separated.
Copy a ton of logic from darktable and libkexiv2 and parse more
metadata tags which contain colorspace information, namely:
Exif.Photo.ColorSpace
Xmp.exif.ColorSpace
Exif.Nikon3.ColorSpace
Exif.Canon.ColorSpace
