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Dear Sir:

Dear Sir:
I don't find the description lacking.
For parsing cblack in DNG and for order used in EXIF tags please see DNG specification: "This tag specifies the zero light ... encoding level, as a repeating pattern. The origin of this pattern is the top-left corner of the ActiveArea rectangle. The values are stored in row-column-sample scan order."
Reading DNG specification may help answering your questions.
For DNG, cblack is filled under "case 0xc619" in parse_tiff_ifd.

Iliah Borg