ProPhoto RGB

Initially, this space looks like a useful working space to use in a reproduction workflow. It has a gamut that is large enough to encompass a practical range of colors used for both digitization and printing, a white point specified as D50, thereby avoiding chromatic adaptation, and a gamma tone curve with a linear segment for dark tones that color engines can interpret. In practice, though, even ProPhoto RGB has some limitations. The initial ICC profile from Kodak is subject to slope-limiting. Subsequent versions neither adopt D50 as the illuminant nor detail white as neutral. A more recent version released by the ICC includes a flare model, which should be avoided. Finally, the large gamut means that there are large gaps in 8-bit form between the 256 steps that can lead to posterization, therefore, the files should be maintained at 16-bits/channel throughout the workflow.

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