Reference white point, specified as a 1-by-3 vector or one of the CIE
standard illuminants, listed in the following table.
Value
White
Point
'a'
CIE standard illuminant A, [1.0985, 1.0000,
0.3558]. Simulates typical, domestic, tungsten-filament
lighting with correlated color temperature of 2856 K.
'c'
CIE standard illuminant C, [0.9807, 1.0000, 1.1822].
Simulates average or north sky daylight with correlated color temperature
of 6774 K. Deprecated by CIE.
'e'
Equal-energy radiator, [1.000, 1.000, 1.000]. Useful as a theoretical
reference.
'd50'
CIE standard illuminant D50, [0.9642, 1.0000, 0.8251].
Simulates warm daylight at sunrise or sunset with correlated color
temperature of 5003 K. Also known as horizon light.
'd55'
CIE standard illuminant D55, [0.9568, 1.0000,
0.9214]. Simulates mid-morning or mid-afternoon daylight
with correlated color temperature of 5500 K.
'd65'
CIE standard illuminant D65, [0.9504, 1.0000, 1.0888].
Simulates noon daylight with correlated color temperature of 6504
K.
'icc'
Profile Connection Space (PCS) illuminant used in ICC profiles. Approximation of
[0.9642, 1.000, 0.8249] using fixed-point, signed, 32-bit
numbers with 16 fractional bits. Actual value: [31595,32768,
27030]/32768.
Converted L*a*b* color values, returned as a numeric array of the same
size and data type as the input.
Attribute
Description
L*
Luminance or brightness of the image. Values are in the range [0, 100], where
0 specifies black and 100 specifies white. As L* increases,
colors become brighter.
a*
Amount of red or green tones in the image. A large positive
a* value corresponds to red/magenta. A large negative
a* value corresponds to green. Although there is no
single range for a*, values commonly fall in the range
[-100, 100] or [-128, 127).
b*
Amount of yellow or blue tones in the image. A large positive
b* value corresponds to yellow. A large negative
b* value corresponds to blue. Although there is no
single range for b*, values commonly fall in the range
[-100, 100] or [-128, 127).
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