colour-2.3.1: A model for human colour/color perceptionSource codeContentsIndex
Data.Colour.CIE
Description
Colour operations defined by the International Commission on Illumination (CIE).
Synopsis
data Colour a
cieXYZ :: Fractional a => a -> a -> a -> Colour a
cieXYZView :: Fractional a => Colour a -> (a, a, a)
luminance :: Fractional a => Colour a -> a
toCIEXYZ :: Fractional a => Colour a -> (a, a, a)
data Chromaticity a
mkChromaticity :: Fractional a => a -> a -> Chromaticity a
chromaCoords :: Fractional a => Chromaticity a -> (a, a, a)
chromaX :: Fractional a => Chromaticity a -> a
chromaY :: Fractional a => Chromaticity a -> a
chromaZ :: Fractional a => Chromaticity a -> a
chromaConvert :: (Fractional b, Real a) => Chromaticity a -> Chromaticity b
chromaColour :: Fractional a => Chromaticity a -> a -> Colour a
lightness :: (Ord a, Floating a) => Chromaticity a -> Colour a -> a
cieLABView :: (Ord a, Floating a) => Chromaticity a -> Colour a -> (a, a, a)
cieLAB :: (Ord a, Floating a) => Chromaticity a -> a -> a -> a -> Colour a
Documentation
data Colour a Source

This type represents the human preception of colour. The a parameter is a numeric type used internally for the representation.

The Monoid instance allows one to add colours, but beware that adding colours can take you out of gamut. Consider using blend whenever possible.

cieXYZ :: Fractional a => a -> a -> a -> Colour aSource
Construct a Colour from XYZ coordinates for the 2° standard (colourimetric) observer.
cieXYZView :: Fractional a => Colour a -> (a, a, a)Source
Returns the XYZ colour coordinates for the 2° standard (colourimetric) observer.
luminance :: Fractional a => Colour a -> aSource
Returns the Y colour coordinate (luminance) for the 2° standard (colourimetric) observer.
toCIEXYZ :: Fractional a => Colour a -> (a, a, a)Source
data Chromaticity a Source
mkChromaticity :: Fractional a => a -> a -> Chromaticity aSource
Constructs Chromaticity from the CIE little x, little y coordinates for the 2° standard (colourimetric) observer.
chromaCoords :: Fractional a => Chromaticity a -> (a, a, a)Source
Returns the CIE little x, little y, little z coordinates for the 2° standard (colourimetric) observer.
chromaX :: Fractional a => Chromaticity a -> aSource
Returns the CIE little x coordinate for the 2° standard (colourimetric) observer.
chromaY :: Fractional a => Chromaticity a -> aSource
Returns the CIE little y coordinate for the 2° standard (colourimetric) observer.
chromaZ :: Fractional a => Chromaticity a -> aSource
Returns the CIE little z coordinate for the 2° standard (colourimetric) observer.
chromaConvert :: (Fractional b, Real a) => Chromaticity a -> Chromaticity bSource
Change the type used to represent the chromaticity coordinates.
chromaColourSource
:: Fractional a
=> Chromaticity a
-> aluminance
-> Colour a
Constructs a colour from the given Chromaticity and luminance.
lightnessSource
:: (Ord a, Floating a)
=> Chromaticity aWhite point
-> Colour a
-> a
Returns the lightness of a colour with respect to a given white point. Lightness is a perceptually uniform measure.
cieLABViewSource
:: (Ord a, Floating a)
=> Chromaticity aWhite point
-> Colour a
-> (a, a, a)
Returns the CIELAB coordinates of a colour, which is a perceptually uniform colour space. The first coordinate is lightness. If you don't know what white point to use, use Data.Colour.CIE.Illuminant.d65.
cieLABSource
:: (Ord a, Floating a)
=> Chromaticity aWhite point
-> aL* coordinate (lightness)
-> aa* coordinate
-> ab* coordinate
-> Colour a
Returns the colour for given CIELAB coordinates, which is a perceptually uniform colour space. If you don't know what white point to use, use Data.Colour.CIE.Illuminant.d65.
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