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Pixels (in raw_image) are

Pixels (in raw_image) are recorded 'as in raw file'.
Colors are depending on camera CFA pattern.
The LibRaw::COLOR(row,col) call will return color for given pixel (row,col) are in image[] coordinate space i.e. visible area (so counted from top_margin,left_margin point of raw_image)

-- Alex Tutubalin @LibRaw LLC