Single CFA color channel from Panasonic FZ50 ISO 100 RAW pushed to about ISO 10,000. 1 ADU in this linear image corresponds to about 0.1 electrons of well charge (or 0.1 photons). Due to the non-linear result of clipping read noise at black, the actual mean level of true black is 8.28 (or 0.828 electrons). Grey numbers are the mean number of electron charge in the area behind the numbers.