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WhitePoint

WhitePoint

is an option for ColorConvert, ChromaticityPlot and other functions to specify the white point.

Details

WhitePoint, also known as the reference white, defines the white color for a specific color space.
Typical settings include:
Automatic automatically determine the white point to use

"name" use a named white point

col use the color col as white point
Common named white points include:

	"A"	- XYZColor[1.098466069456375`,1,0.3558228003436005`]
	"B"	- XYZColor[0.9909274480248003`,1,0.8531327322886154`]
	"C"	- XYZColor[0.980705971659919`,1,1.1822494939271255`]
	"D50"	- XYZColor[0.9642119944211994`,1,0.8251882845188288`]
	"D55"	- XYZColor[0.956797052643698`,1,0.9214805860173273`]
	"D65"	- XYZColor[0.9504285453771808`,1,1.0889003707981277`]
	"D75"	- XYZColor[0.9497220898840718`,1,1.226393520724154`]
	"E"	- XYZColor[1,1,1]
	"F1"	- XYZColor[0.92833634773327`,1,1.0366471966080588`]
	"F2"	- XYZColor[0.9914466146180286`,1,0.6731594233792534`]
	"F3"	- XYZColor[1.0375348719249304`,1,0.49860512300278975`]
	"F4"	- XYZColor[1.091472637556101`,1,0.38813260928860127`]
	"F5"	- XYZColor[0.9087197011381077`,1,0.9872288668153252`]
	"F6"	- XYZColor[0.9730912836358956`,1,0.6019054976181281`]
	"F7"	- XYZColor[0.950171560440895`,1,1.086296420004251`]
	"F8"	- XYZColor[0.9641254355400697`,1,0.8233310104529616`]
	"F9"	- XYZColor[1.0036479708162336`,1,0.678683511708377`]
	"F10"	- XYZColor[0.9617351192130272`,1,0.8171233257377868`]
	"F11"	- XYZColor[1.0089889428048684`,1,0.6426166043539363`]
	"F12"	- XYZColor[1.0804628965653669`,1,0.39227516629163484`]

The sRGB color space is defined with "D65", and the XYZ color space is usually defined with "D50".

Examples

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Basic Examples (2)

Convert a white sRGB color using the default white point:

Wolfram Language code: ColorConvert[RGBColor[1, 1, 1], "XYZ"]//InputForm

Use a custom white point:

Wolfram Language code: ColorConvert[RGBColor[1, 1, 1], "XYZ", WhitePoint -> "D65"]//InputForm

Show a white point on a slice of the sRGB space:

Wolfram Language code: ChromaticityPlot["sRGB", WhitePoint -> Automatic]

Turn the white point off:

Wolfram Language code: ChromaticityPlot["sRGB", WhitePoint -> None]

Scope (4)

Color Conversion (1)

Convert from XYZ to Lab using the default white reference (D50):

Wolfram Language code: ColorConvert[XYZColor[.3, .4, .5], "LAB"]//InputForm

Specify a different white:

Wolfram Language code: ColorConvert[XYZColor[.3, .4, .5], "LAB", WhitePoint -> "D65"]//InputForm

Visualization (3)

Show a particular white point:

Wolfram Language code: ChromaticityPlot["RGB", WhitePoint -> "E"]

Choose a specific color as the white point:

Wolfram Language code: ChromaticityPlot["RGB", WhitePoint -> XYZColor[.9, 1, .8]]

Specify a list of white points:

Wolfram Language code: ChromaticityPlot["RGB", WhitePoint -> {"D50", "D65"}]

Applications (1)

Compare the RGB gamut with the complete series of supported fluorescent white points:

Wolfram Language code: ChromaticityPlot3D["RGB", "XYZ", WhitePoint -> ("F" <> ToString[#]&) /@ Range[12]]

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