colour.munsell_value¶

colour.munsell_value(Y, method='ASTM D1535')[source]¶

Returns the Munsell value \(V\) of given luminance \(Y\) using given method.

Parameters

Y (numeric or array_like) – luminance \(Y\).
method (unicode, optional) – {‘ASTM D1535’, ‘Priest 1920’, ‘Munsell 1933’, ‘Moon 1943’, ‘Saunderson 1944’, ‘Ladd 1955’, ‘McCamy 1987’}, Computation method.

Returns

Munsell value \(V\).

Return type

numeric or ndarray

Notes

Domain	Scale - Reference	Scale - 1
`Y`	[0, 100]	[0, 1]

Range	Scale - Reference	Scale - 1
`V`	[0, 10]	[0, 1]

References

[ASTMInternational89], [Wik07d]

Examples

>>> munsell_value(12.23634268)  
4.0824437...
>>> munsell_value(12.23634268, method='Priest 1920') 
3.4980484...
>>> munsell_value(12.23634268, method='Munsell 1933') 
4.1627702...
>>> munsell_value(12.23634268, method='Moon 1943') 
4.0688120...
>>> munsell_value(12.23634268, method='Saunderson 1944')
... 
4.0444736...
>>> munsell_value(12.23634268, method='Ladd 1955') 
4.0511633...
>>> munsell_value(12.23634268, method='McCamy 1987') 
array(4.0814348...)