XMP data are not written to PNG images (CGImageDestinationAddImageAndMetadata API)

Originator:raphael
Number:rdar://15431893 Date Originated:09-Nov-2013 04:58 PM
Status:Open Resolved:
Product:iOS SDK Product Version:iOS 7.0.3
Classification:Other Bug Reproducible:Always
 
Summary:
When using Image IO API to write PNG files with custom embedded XMP data, written PNG files don't contain the XMP data.
This works as expected for TIFF and JPEG files. As the XMP norm is compatible with PNG files, it is expected that the Image IO API be able to write such XMP data into PNG files.

APIs used:
CGImageDestinationCreateWithURL
CGImageMetadataCreateMutable
CGImageMetadataRegisterNamespaceForPrefix
CGImageMetadataSetValueWithPath
CGImageDestinationAddImageAndMetadata
CGImageDestinationFinalize

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