Metadata and Standard Flexibility
SMPTE Specifications dictate a mild number of compulsory metadata, like image resolution, color space details (channel depth, colorimetric metric, etc.), number of planes/subimages, as well as original filename and creation date/time, creator's name, project name, copyright information, and so on.
Furthermore, a couple of industry-specific metadata areas are present: Motion-Picture and Television ones. They are either used only if the picture has enough embedded information relevant to that specific industry, otherwise are left "empty". For example, Motion-Picture-specific metadata include perforation-exact film KeyKode (if the image comes from a film scan), camera shutter angle, slate information and frame positioning within a frame sequence. On the other side, Television metadata include full SMPTE time code, video overscan and field information, and signal/colour level information.
At last, a third, variable-size metadata area, which is user-definable, exists. Third-party applications/software occasionally use this area to store additional information; for example, when the DPX stores images with technical specifications far away from the original standard (like pictures coded in the CIE XYZ color space, or Bayer-patterned raw frames from specific digital cameras like the Arriflex D-21).
Read more about this topic: Digital Picture Exchange
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