ImageGear for C and C++ on Windows v19.10 - Updated
HD Metadata Structure
User Guide > File Formats and Compressions > File Formats > Metadata Structures > HD Metadata Structure

HD Photo format uses the same non-image data storage format as is used by TIFF. However, HD Photo uses its own set of tags for image-related parameters, such as image width, height and pixel format. It also uses a few descriptive TIFF tags such as Copyright and Artist. HD Photo non-image data may include EXIF, EXIF GPS and IPTC subtrees.

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