sRGB2RGBFunctor< From, To > Class Template Reference

Convert standardized sRGB into non-linear (raw) RGB. 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
result_type	operator() (argument_type const &rgb) const

	sRGB2RGBFunctor ()

	sRGB2RGBFunctor (component_type max)

Detailed Description

template<class From, class To = From>
class vigra::sRGB2RGBFunctor< From, To >

Convert standardized sRGB into non-linear (raw) RGB.

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

The sRGB color space is a slight improvement over the R'G'B' space. Is 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

$C_{RGB} = \left\{\begin{array}{ll} C_{sRGB} / 12.92 & \textrm{if }\frac{C_{sRGB}}{C_{max}} \le 0.04045 \\ C_{max}\left( \frac{C_{sRGB}/C_{max}+0.055}{1.055}\right)^{2.4} & \textrm{otherwise} \end{array}\right.$

where C is one of the color channels R, G, or B, and $C_{max}$ equals 255 by default (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.