Three different ways to compute gradients:

Left: Interpolation in a linear color space (assumed_gamma 1.0); color 
gradients look fine, while greyscale gradients appear to be biased 
towards white (despite being physically linear).

Center: Interpolation in a gamma 2.5 color space; greyscale gradients 
look better (despite being physically non-linear), but color gradients 
have a tendency to look too dark in the transition zone.

Right: Interpolating the R:G:B ratio linearly, then adjusting for a 
brightness interpolated in a gamma 2.5 color space, yields both pleasing 
color and brightness gradients.

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