Use irot box to get HEIC/HEIF rotation angle #131
Merged
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This should fix #130.
According to the HEIF standard, HEIF files can store EXIF metadata in
Exif
item, but the format also has a built-in way of transforming images:irot
property rotates the image 0, 90, 180 or 270 degrees.It's unclear whether you should use EXIF orientation or the built-in transformations. For instance, iOS creates HEIF files with both EXIF orientation and
irot
property containing equivalent values.