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EXCERPT page containing first few paragraphs. 2021-11-29 13:21:11

Sony RX1

File Sizes and Bit Depth

The Sony Cybershot DSC- RX1 produces 24-megapixel (6000 X 4000) finished RGB images from its 6024 X 4024 full frame sensor.

Sony’s marketing material makes a false claim:

The BIONZ® image processor enables ... 14-bit RAW image data recording.

The claim should be understood as “14 bit image data from the sensor processed in full bit resolution then tonally compressed to an 8-bit representation and stored as 8 bits per pixel”. (It is not entirely clear if the pipeline is entirely 14-bit or partially 12-bit).

The actual recorded files are a fixed 8 bits per pixel, by simple math (6024 X 4024 * 1 byte = 24.24 MB, actual file sizes are a fixed 25.2MB total size including overhead, see screen shot at right). With real 14-bit files (Nikon D800/D800E), file sizes are continuously variable using a lossless compression method. The 'lossless' aspect is why they are variable size; no lossless compression algorithm can ever guarantee a fixed size.

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