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RGBPrime2YPrimeIQFunctor< T > Class Template Reference |  |
Convert non-linear (gamma corrected) R'G'B' into Y'IQ components. 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 | |
| template<class V > | |
| result_type | operator() (V const &rgb) const |
| RGBPrime2YPrimeIQFunctor () | |
| RGBPrime2YPrimeIQFunctor (component_type max) | |
Detailed Description
template<class T>
class vigra::RGBPrime2YPrimeIQFunctor< T >
Convert non-linear (gamma corrected) R'G'B' into Y'IQ components.
#include <vigra/colorconversions.hxx>
Namespace: vigra
According to the PAL analog video standard, the functor realizes the transformation
![\[ \begin{array}{rcl} Y' & = & 0.299\enspace R / R_{max} + 0.587\enspace G / G_{max} + 0.114\enspace B / B_{max}\\ I & = & 0.596\enspace R / R_{max} - 0.274\enspace G / G_{max} - 0.322\enspace B / B_{max} \\ Q & = & 0.212\enspace R / R_{max} - 0.523\enspace G / G_{max} + 0.311\enspace B / B_{max} \end{array} \]](form_37.png)
By default, 
. This default can be overridden in the constructor. Y' represents the luminance ("brightness") of the color. The transformation is scaled so that the following bounds apply:
![\[ \begin{array}{rcl} 0 \leq & Y' & \leq 1 \\ -0.596 \leq & I & \leq 0.596 \\ -0.523 \leq & Q & \leq 0.523 \end{array} \]](form_38.png)
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
default constructor. The maximum value for each RGB component defaults to 255.
constructor
- max - the maximum value for each RGB component
Member Function Documentation
| result_type operator() | ( | V const & | rgb | ) | const |
apply the transformation
The documentation for this class was generated from the following file:
- vigra/colorconversions.hxx