It offers an especially large gamut designed for use with photographic output in mind.

The ProPhoto RGB primaries were also chosen in order to minimize hue rotations associated with non-linear tone scale operations.

This will occur more frequently in 8-bit modes as the gradient steps are much larger.

There are two corresponding scene space color encodings known as RIMM RGB (Reference Input Medium Metric) intended to encode standard dynamic range scene space images, and ERIMM RGB intended to encode extended dynamic-range scene space images.

[5][6] The development of the ProPhoto RGB and other color spaces is documented in an article[7] summarizing a presentation by one of its developers Geoff Wolfe at Kodak, currently senior research manager at Canon Information Systems Research Australia, at the IS&T/SPIE Color Imaging Conference in 2011. where and and