Three versions of a test thingumajig with plenty of gradients, in an 
assumed_gamma 1.0 scene.

Make sure to view this image on a properly calibrated display.

Left: Linear interpolation, corresponding to current behaviour with 
assumed_gamma 1.0. Note how the black-to-white transition appears to 
have a strong white bias; the black-to-green transition also looks quite 
troublesome.

Center: Interpolation of gamma-encoded values, corresponding to current 
behaviour with assumed_gamma 2.2 (or #version 3.6 scenes without 
assumed_gamma). (Except that in this case the gamma is 2.5.) Note how 
the black-to-something transitions appear much more balanced, but at the 
cost of a notable darkening between colours.

Right: Linear interpolation of chromaticity, with gamma-encoded 
interpolation of brightness. Best of both worlds if I'm asked.

All three modes will soon become available in POV-Ray proper.

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