- images where metadata is encoded after image data are not supported (should not happen in real world, because such data layout not recommended by standard)
- cropping transformation (
clapbox) is ignored (anyway, no supported by browsers yet)
- exif (with orientation) is ignored, if placed after image data (should not happen in real world, because such data layout not recommended by standard)
- exif (with orientation) is ignored (not supported by browsers anyway)
- Full download required, because exif data is frequently located at the end of file.