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0...999 range is reserved for

0...999 range is reserved for future custom layouts, like Fuji 6x6.

32 bits describes 16 pixels, 4x4 block. For all today cameras it is repeated 2x2 blocks.
00 - red, 01 - green, 10 - blue, 11 - green2 channels

(just use LibRaw::COLOR(row,col) call to get layout)

-- Alex Tutubalin @LibRaw LLC