Lists all HD Photo tag identifiers.

Values:

IGMDTAG_ID_HDP_DATA	HD Photo metadata format identifier.
IGMDTAG_ID_HDP_PIXELFORMAT	Pixel format.
IGMDTAG_ID_HDP_IMAGEWIDTH	Image width.
IGMDTAG_ID_HDP_IMAGEHEIGHT	Image height.
IGMDTAG_ID_HDP_WIDTHRESOLUTION	Width resolution.
IGMDTAG_ID_HDP_HEIGHTRESOLUTION	Height resolution.
IGMDTAG_ID_HDP_IMAGEOFFSET	Image offset.
IGMDTAG_ID_HDP_IMAGEBYTECOUNT	Image byte count.
IGMDTAG_ID_HDP_ALPHAOFFSET	Alpha offset.
IGMDTAG_ID_HDP_ALPHABYTECOUNT	Alpha byte count.
IGMDTAG_ID_HDP_UNCOMPRESSED	Specifies that the image data is uncompressed.
IGMDTAG_ID_HDP_TRANSFORMATION	Transformation to be applied when decoding the image to present the desired representation.
IGMDTAG_ID_HDP_IMAGEDATADISCARD	Image data discard.
IGMDTAG_ID_HDP_ALPHADATADISCARD	Alpha data discard.
IGMDTAG_ID_HDP_IMAGETYPE	Image type.
IGMDTAG_ID_HDP_ICCPROFILE	ICC Profile.
IGMDTAG_ID_HDP_XMP	XMP metadata.
IGMDTAG_ID_HDP_PADDING	Data padding.