Observers and Illuminants¶

Illuminants and observer angles are used in all color spaces that use reflective (instead of transmissive) light. Here are a few brief overviews of what these are and what they do:

Understanding Standard Illuminants in Color Measurement - Konica Minolta
What is Meant by the Term “Observer Angle”? - XRite

To adjust the illuminants and/or observer angles on a color:

lab = LabColor(0.1, 0.2, 0.3, observer='10', illuminant='d65')

Two-degree observer angle¶

These illuminants can be used with observer='2', for the color spaces that require illuminant/observer:

'a'
'b'
'c'
'd50'
'd55'
'd65'
'd75'
'e'
'f2'
'f7'
'f11'

Ten-degree observer angle¶

These illuminants can be used with observer='10', for the color spaces that require illuminant/observer:

'd50'
'd55'
'd65'
'd75'