Re: Is there an HDM CMM for MacOS or Windows7-8?
Re: Is there an HDM CMM for MacOS or Windows7-8?
- Subject: Re: Is there an HDM CMM for MacOS or Windows7-8?
- From: Graeme Gill <email@hidden>
- Date: Fri, 08 Mar 2013 10:37:32 +1100
Roger Breton wrote:
> Is tetrahedral interpolation more involved, computationally?
It uses less computation. It uses dimension + 1 vertices of a
grid cell. N-linear interpolation uses 2^dimension
(ie. all of) the vertices of a grid cell. So that's a difference
of 5 to 16 for CMYK->whatever, or 4 to 8 for RGB/Lab/XYZ->whatever
From a quality point of view the recommendation is to use
simplex/tetrahedral interpolation for spaces that are
"device like", ie. A->B tables typically, where neutral lightness
changes are strongly correlated to equal changes in the input channels.
For spaces where a change in neutral lightness is correlated to
one input channel while the the others remain about the same,
the N-linear is recommended. This is the case for doing L*a*b*-> whatever,
ie. a B->A table.
For actual overall (optimised for speed) transforms, simplex/tetrahedral
is usually used anyway, because it's the fastest
(unless you are using GPU hardware texture mapping).
Graeme Gill.
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