vigra - RGB2XYZFunctor< T > Class Template Reference

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| RGB2XYZFunctor< T > Class Template Reference Color Space Conversions |

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

typedef NumericTraits<T>::RealPromote component_type

the result's component type

typedef TinyVector<T, 3> argument_type

the functor's argument type

typedef TinyVector<component_type, 3> result_type

the functor's result type

typedef TinyVector<component_type, 3> value_type

Deprecated:
  use argument_type and result_type

## Constructor & Destructor Documentation

RGB2XYZFunctor | ( |  | ) |

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

RGB2XYZFunctor | ( | component_type | max | ) |

constructor

- max - the maximum value for each RGB component

## Member Function Documentation

result_type operator() | ( | argument_type const & | rgb | ) | const

apply the transformation

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

- vigra/colorconversions.hxx

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.10.0 (Mon Nov 18 2013)