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

$\‍[ \begin{array}{rcl} Y' & = & 0.299\enspace R / R_{max} + 0.587\enspace G / G_{max} + 0.114\enspace B / B_{max}\\ I & = & 0.596\enspace R / R_{max} - 0.274\enspace G / G_{max} - 0.322\enspace B / B_{max} \\ Q & = & 0.212\enspace R / R_{max} - 0.523\enspace G / G_{max} + 0.311\enspace B / B_{max} \end{array} \‍]$

By default, $R_{max} = G_{max} = B_{max} = 255$ . 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: