0 - 255 Histograms

[sol33]

Here is the answer. Apparently this item is no longer on the web, but we owe many thanks to Julia Borg for creating it.

Ranchu is correct. The 14bit data in raw files is linear, but the 8bit data in jpeg files is gamma corrected. The most common gamma value is 2.2 which is (roughly) what is used in sRGB. Gamma 1.8 was common for older Macintosh computers, but since 10.6 Leopard Macs use a gamma of 2.2 too. A gamma of 1 is no gamma correction at all so this column represents linear data. However, 8 bit of linear data allow for only 8 stops of dynamic range, thats why raw files have more bits.