>> May I ask the stupid question, "why not"?
>>
>> I would expect the Lch colour space to encompass all the RGB colour
>> space, so the boundaries of the latter should be sufficient to bound the
>> shape.
>>
>> My guess is that the issues you see with the shape are due to bogosities
>> in your colour conversion functions.
>>
>
> L, C and H are supposed to form a cylinder. There are some very small
> sRGB bits poking outside of the cylinder. I guess I could show the bits
> as well, as long as I explain what they are.

If sRGB is poking out of your cylinder, then Adobe RGB is going to poke 
out even more, and the entire human visual range is going to be much 
larger. Are you sure you've got the radius of your cylinder correct to 
match your colour calculations? Also it would be surprising to me if the 
human visual range came out exactly as a cylinder (after a brief glance 
of the maths involved), are you sure about this?

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