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Could you please explain 12

Could you please explain 12 vs 14 bit difference for Sony cRAW format:

1) Data stored in 8-bit per pixel overall (16-pixel blocks, 11-bit base value, 7-bit deltas)
2) After decompression: 11 bit non-linear data
3) After linearization curve applied: ??bit data with data range 0...~17000

File format is the same for 12-bit ADC cameras (e.g. A700), real 14-bit ADC (e.g. Sony A7r) and 14-bit ADC in 12-bit mode (A7R in electronic shutter mode).

-- Alex Tutubalin