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We could use larger shift amounts to exaggerate the color in the shadow even more. Or we can go the other way. With a negative shift amount such as -1.0, we can partly desaturate the areas in shadow from the small light:
Code for the display filter can be found in the examples distribution as
PxrLightSaturation.cpp together with the full scene,
If unset then areas lit by the light will be modified and areas fully
in shadow will be left alone. Set this to invert that and change the
saturation of the shadows of this light.