Decoder IFD access #412
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Decoder IFD access #412
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cytrinox
commented
Mar 7, 2024
cytrinox
commented
For example, if you know you're dealing with DNG raw files (Decoder::format_hint) and want to extract OpcodeList3, you can access the raw IFD with decoder.ifd(WellKnownIFD::Raw) and query this IFD for DngTag::OpcodeList3 entry. There are also virtual IFDs. Decoders can provide collections of useful tags as virtual IFDs like format specific tags that are difficult to read manually. This commit introduces two virtual IFDs: * VirtualDngRootTags * VirtualDngRawTags These IFDs can be used by any decoder implementation to pass-through DNG tags to dng-writer. This is useful if a raw file format provides information that can be used to populate DNG tags. Decoder::ifd() is implemented only for DNG decoder yet but it's easy to extend it to all other decoders.
Some cameras embed the raw data inside Makernotes and as Exif struct is part of analyze metadata during test cases, it would serialize the whole pixels into yaml files.
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