[...] It seems to be a fairly meaningless numbers game. [...] Not
only is xy space far from perceptually uniform, the area comparison
says little about how well one gamut is enclosed by the other.
[...] you plot a colorspace gamut in 3 Dimensions in (say) CIELAB
space [...].
For me it alway seemed to be a strange idea to compare three-dimensional
bodies with two-dimensional (area-)metrics. Maybe this is connected with
my native language: the German word for "space" (in colorspace) refers
fairly unique to something spatial, 3-dimensional -- in contrast to the
English word, which can also mean something like "range" or "scope".
Cubic delta E in CIELab is a more modern measure of gamut volume,
rather than 2D plots that conceal what's really going on.
To compare gamuts in a meaningful way, we have to use volume metrics --
no doubt.
So a usable measure would be the volume of the device gamut
intersection with the target gamut, as a percentage of the target
gamut volume, in CIELab space cubic delta E.
That's exactly what we need.
Klaus
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