colour-2.3.1: A model for human colour/color perception Source code Contents Index

Data.Colour.RGBSpace.HSL

Synopsis

data RGB a hslView :: (Fractional a, Ord a) => RGB a -> (a, a, a) hue :: (Fractional a, Ord a) => RGB a -> a saturation :: (Fractional a, Ord a) => RGB a -> a lightness :: (Fractional a, Ord a) => RGB a -> a hsl :: (RealFrac a, Ord a) => a -> a -> a -> RGB a

Documentation

data RGB a Source

An RGB triple for an unspecified colour space.

hslView :: (Fractional a, Ord a) => RGB a -> (a, a, a) Source

Returns the HSL (hue-saturation-lightness) coordinates of an RGB triple. See hue, saturation, and lightness.

hue :: (Fractional a, Ord a) => RGB a -> a Source

The hue coordinate of an RGB value is in degrees. Its value is always in the range 0-360.

saturation :: (Fractional a, Ord a) => RGB a -> a Source

Returns the saturation coordinate of an RGB triple for the HSL (hue-saturation-lightness) system. Note: This is different from Data.Colour.RGBSpace.HSV.saturation for the Data.Colour.RGBSpace.HSV

lightness :: (Fractional a, Ord a) => RGB a -> a Source

Returns the lightness coordinate of an RGB triple for the HSL (hue-saturation-lightness) system.

hsl :: (RealFrac a, Ord a) => a -> a -> a -> RGB a Source

Convert HSL (hue-saturation-lightness) coordinates to an RGB value. Hue is expected to be measured in degrees.

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