Re: [PATCH] New pm3d corners2color function

[Petr M. <mi...@ph...>]

> There is an option "set pm3d interpolate <xdelta>,<ydelta>" that
> produces smoother coloring subdividing each quadrangle into smaller
> quadrangles with individually calculated color values.  But these
> color values are always assign by linear interpolation.
>
> For color schemes c1/c2/c3/c4/mean this comes out equivalent to the
> same overall coloring applied to a finer grid of x,y values.  The
> finer the interpolation, the closer it comes to a true linear color
> gradient.
>
> However, for color schemes using the harmonic or geometric mean,
> the finer grid still results in a linear color gradient rather than
> the requested geometric or harmonic color variation.  Shouldn't the
> interpolation in these cases be some non-linear function?
> What function would that be?

Coordinates x, y can be interpolated linearly, but the colour coords can 
follow arithmentic, geometric or harmonic mean.

---
Petr