Data.Colour.Nonlinear

Support for the "sRGB" colour space.

This colour space is the de facto standard colour space for computer data, unless some more specific colour space is explicitly specified. Unless you know differently, any image data received from the outside world is probably sRGB, and and data output is probably expected to be sRGB.

Unfortunately, sRGB is a non-linear colour space, so it is not feasible to perform arithmetic in it directly. (The sRGB colour space basically standardises the defective non-linear behaviour of obsolete CRT display technology.)

Types

newtype Colour_sRGB

Type for holding sRGB colour values (with Double components).

The standard Colour type is for linear RGB values. This type is for sRGB colours, which are non-linear.

Constructors

Colour_sRGB Colour

Instances

Eq Colour_sRGB

Ord Colour_sRGB

Show Colour_sRGB

newtype Colour8_sRGB

Type for holding sRGB colour values (with Word8 components).

The standard Colour8 type is for linear RGB values. This type is for sRGB colours, which are non-linear.

Constructors

Colour8_sRGB Colour8

Instances

Eq Colour8_sRGB

Ord Colour8_sRGB

Show Colour8_sRGB

Conversions

colour_to_sRGB :: Colour -> Colour_sRGB

Convert a linear RGB value into a non-linear sRGB value.

cdemote_sRGB :: Colour_sRGB -> Colour8_sRGB

Convert from Double components to Word8 components.

cpromote_sRGB :: Colour8_sRGB -> Colour_sRGB

Convert from Word8 components to Double components.

colour_from_sRGB :: Colour_sRGB -> Colour

Convert a non-linear sRGB value into a linear RGB value.