Am 29.11.2016 um 18:26 schrieb Mike Horvath:
> On 11/29/2016 7:52 AM, scott wrote:
>> The "basis" of most colour spaces is XYZ. XYZ defines a colour exactly
>> (in terms of human perception) with just three numbers. The numbers are
>> linear in terms of physical power, so if you have two light sources in
>> very close proximity, you can simply add the two XYZ values to get the
>> resulting colour. What this means though is that doubling XYZ does not
>> give a perceived brightness twice as bright. Note there is no dependency
>> on any "white point", the three numbers alone are enough.
> 
> The LAB > XYZ > RGB conversion algorithms I am using simply don't
> *function* without setting a white point, though.
> 
> http://colormine.org/

Of course not. You can't convert to RGB unless you know /what/ RGB model
you're converting to, and whitespace is one of the defining factors.

You will also need to specify the colour primaries, if the conversion
algorithm is any good.

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