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Each pixel is 4-component, 16

Each pixel is 4-component, 16 bit per component.

On unpack() sensors only one component is filled. There is two exceptions:
* if half_size parameter is set, then image is resized two-fold (in each dimension), and all 4 components if image[i] filled with data
* for foveon-based sensors three components is filled.

On postprocessing stage remaining components are interpolated 'in-place', without image[] reallocation

-- Alex Tutubalin