>> 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.

That's what I took perceptually linear to mean... having never heard 
that term before.

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