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#39 Pattanaik rod/cone parameters severely limited
The Pattanaik operator uses rod and cone settings to specify the level of adaptation of the HVS model. In daylight, the human eye will adapt to levels in the thousands; in dim light, these levels will be on the order of 10, 1, or even less (cd/m^2).
Cones in the retina provide color recognition but do not respond to light levels below a few hundred cd/m^2, so the dark-adapted eye will perceive desaturated colors.
Because Luminance HDR limits the rod and cone levels to a range of 0.0 to 1.0, it will always produce desaturated images when using this operator with low multiplier values. Higher multiplier values are needed to get normal colors, but such values require cone and rod to be scaled proportionally, otherwise an all-white image results.
pfstmo_pattanaik00, with rod and cone set to approximate 4000 to 5000 and multiplier set to about 400, gives me more realistic results that aren't acheiveable with the limited range in Luminance HDR. I suggest extending the range of rod and cone to at least 10000, perhaps higher.
Incidentally, with local tonemapping selected for Pattanaik, rod and cone settings have no effect (even with auto cone/rod off). These sliders should always be disabled when using local mode; they are currently enabled in local mode if auto is off.
