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I'm not sure, that margins

I'm not sure, that margins are also multiple of 6 in 0.19. Extra effort is needed to analyze (source inspection, may be debugger session), so I won’t do it,

If not, xtrans[][] is for visible area, xtrans_abs[][] is for entire sensor (make sure you use LibRaw-provided margins).

0 is 'channel #0', 1 is 'channel #1', etc. Index to name mapping is in imgdata.idata.cdesc[] string.

-- Alex Tutubalin @LibRaw LLC