For this reason, DPX is the worldwide-chosen format for still frames storage in most digital intermediate post-production facilities and film labs.
The DPX specification allows for a wide variety of metadata to further clarify information stored (and storable) within each file.
Extensions for high-dynamic-range video and wide color gamut are standardized in SMPTE ST 268-2:2018.
SMPTE specifications dictate a mild number of compulsory metadata, like image resolution, color space details (channel depth, colorimetric metric, etc.
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).