A quick note about camera raw files and xmp sidecars

Because a raw file straight from the camera typically cannot be modified using software, any metadata applied to the file that you want to save on disk must be stored elsewhere. The most common method is the use of sidecar files in .xmp (Extensible Metadata Platform) format. A sidecar file is associated with a specific, individual image file and contains metadata changes made to the raw file in software such as Lightroom and Adobe Camera Raw. The sidecar must always accompany the original file in order for the metadata changes to be saved or read by the software. This is one reason I recommend using dng f or your raw originals instead of native camera raw files, because you can save xmp metadata directly into dng files. More about dngs la ter.

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