Add mimetype for HEJ2 format
This is an image format which is already supported in development GIMP, KDE/kimageformats is going to support it soon.
The format is using similar container like HEIF but JPEG 2000 compression for image data.
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This is an image format which is already supported in development GIMP, KDE/kimageformats is going to support it soon.
The format is using similar container like HEIF but JPEG 2000 compression for image data.