RGB2XYZFunctor< T > Class Template Reference

Convert linear (raw) RGB into standardized tri-stimulus XYZ. More...

#include <vigra/colorconversions.hxx>

Public Types
typedef TinyVector< T, 3 >	argument_type
typedef NumericTraits< T >::RealPromote	component_type
typedef TinyVector< component_type, 3 >	result_type
typedef TinyVector< component_type, 3 >	value_type

Public Member Functions
result_type	operator() (argument_type const &rgb) const
	RGB2XYZFunctor ()
	RGB2XYZFunctor (component_type max)

Detailed Description

template<class T>
class vigra::RGB2XYZFunctor< T >

Convert linear (raw) RGB into standardized tri-stimulus XYZ.

#include <vigra/colorconversions.hxx>
Namespace: vigra

According to ITU-R Recommendation BT.709, the functor realizes the transformation

By default, . This default can be overridden in the constructor. X, Y, and Z are always positive and reach their maximum for white. The white point is obtained by transforming RGB(255, 255, 255). It corresponds to the D65 illuminant. Y represents the luminance ("brightness") of the color. The above transformation is officially defined in connection with the sRGB color space (i.e. when the RGB values are obtained by inverse gamma correction of sRGB), other color spaces use slightly different numbers or another standard illuminant (which gives raise to significantly different numbers).

Traits defined:

FunctorTraits::isUnaryFunctor is true (VigraTrueType)

Member Typedef Documentation

component_type

template<class T>

typedef NumericTraits<T>::RealPromote component_type

the result's component type

argument_type

template<class T>

typedef TinyVector<T, 3> argument_type

the functor's argument type

result_type

template<class T>

typedef TinyVector<component_type, 3> result_type

the functor's result type

value_type

template<class T>

typedef TinyVector<component_type, 3> value_type

Deprecated

use argument_type and result_type

Constructor & Destructor Documentation

RGB2XYZFunctor() [1/2]

template<class T>

RGB2XYZFunctor

(

)

default constructor. The maximum value for each RGB component defaults to 255.

RGB2XYZFunctor() [2/2]

template<class T>

RGB2XYZFunctor

(

component_type

max

)

constructor

• max - the maximum value for each RGB component

Member Function Documentation

operator()()

template<class T>

result_type operator()

(

argument_type const &

rgb

)

const

apply the transformation

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The documentation for this class was generated from the following file:

• vigra/colorconversions.hxx