Am 06.01.2016 um 10:49 schrieb scott:

> In fact, there's a metric called "delta-E" which is used extensively in
> many indsutries where colour is important (clothing, painting, make-up,
> plastics, food, printing etc) that is exactly the "distance" between two
> colours. However it is calculated in a (near) perceptually linear colour
> space, and scaled so that a delta-E of 1.0 is "just visible" by most
> humans. It is then a very useful number indeed.

Actually that colour space is nowhere near perceptually linear --
perceptually equidistant might be a more fitting description.

If you take two arbitrary colours in that colour space, and try to
interpolate them, you'll usually get a nasty surprise.

It's a bit akin to map projections, where a projection that lets you
easily judge areas will be useless to find the shortest route between
two points, let alone identify the point smack halfway between them.

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