Add support for Apple gain maps (iPhone jpegs) #2960
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maryla-uc
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These use a different XMP syntax on the gain map image, and do not carry XMP on the main image. Moreover, the alternate headroom may not be present in the XMP, in which case it's read from the Apple Maker Notes in Exif.
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vrabaud
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These use a different XMP syntax on the gain map image, and do not carry XMP on the main image.
Moreover, the alternate headroom may not be present in the XMP, in which case it's read from the Apple Maker Notes in Exif.
#2944