RGB2sRGBFunctor< From, To > Class Template Reference

Convert linear (raw) RGB into standardized sRGB. More...

#include <vigra/colorconversions.hxx>

Public Types
typedef TinyVector< From, 3 >	argument_type

typedef NumericTraits< To > ::RealPromote	component_type

typedef TinyVector< To, 3 >	result_type

typedef TinyVector< To, 3 >	value_type

Public Member Functions
template<class V >
result_type	operator() (V const &rgb) const

	RGB2sRGBFunctor ()

	RGB2sRGBFunctor (component_type max)

Detailed Description

template<class From, class To = From>
class vigra::RGB2sRGBFunctor< From, To >

Convert linear (raw) RGB into standardized sRGB.

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

The sRGB color space is a slight improvement over the R'G'B' space. It is now a widely accepted international standard (IEC 61966-2.1) which is used by most consumer products (digital cameras, printers, and screens). The functor realizes the transformation

$C_{sRGB} = \left\{ \begin{array}{ll} 12.92\,C_{RGB} & \textrm{ if }\frac{C_{RGB}}{C_{max}} \le 0.0031308 \\ C_{max}\left( 1.055 \left(\frac{C_{RGB}}{C_{max}}\right)^{1/2.4}-0.055\right) & \textrm{ otherwise} \end{array} \right.$

where C is any of the primaries R, G, and B. By default, $C_{max} = 255$ (this default can be overridden in the constructor). If both source and target color components are stored as unsigned char, a look-up-table will be used to speed up the transformation.