transformations between color spaces More...

#include <TransformColorSpace.h>

Public Member Functions
	TransformColorSpace ()
	constructor

	~TransformColorSpace ()
	destructor

void	SetMaxColorValue (double maxColorValue)
	sets new maximum value for color component WARNING: use this class as an object instead of directly the static methods when using this method if not, the standard value 255 is going to be used no matter what

void	SetReferenceWhite (ColorValue referenceWhite)
	sets new reference white level WARNING: use this class as an object instead of directly the static methods when using this method if not, the standard value D65 is going to be used no matter what

ColorValue	GetReferenceWhite ()
	sets new reference white level WARNING: use this class as an object instead of directly the static methods when using this method if not, the standard value D65 is going to be used no matter what

ColorValue	sRGBtoXYZ (ColorValue rgbValue)
	converts incoming sRGB color to XYZ conversion coefficients and formulae from http://www.brucelindbloom.com/ XYZ values are normalized in range 0 to 1 More...

ColorValue	XYZtosRGB (ColorValue xyzValue)
	converts incoming XYZ color to sRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ XYZ values are normalized in range 0 to 1 More...

ColorValue	AdobeRGBtoXYZ (ColorValue rgbValue)
	converts incoming AdobeRGB color to XYZ conversion coefficients and formulae from http://www.brucelindbloom.com/ XYZ values are normalized in range 0 to 1 More...

ColorValue	XYZtoAdobeRGB (ColorValue xyzValue)
	converts incoming XYZ color to AdobeRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ More...

ColorValue	sRGBtoLuv (ColorValue rgbValue)
	converts incoming sRGB color to Luv conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	LuvtosRGB (ColorValue luvValue)
	converts incoming Luv color to sRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	XYZtoLuv (ColorValue xyzValue)
	converts incoming XYZ color to Luv conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	LuvtoXYZ (ColorValue luvValue)
	converts incoming Luv color to XYZ XYZ values are normalized in range 0 to 1 conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	sRGBtoLab (ColorValue rgbValue)
	converts incoming sRGB color to Lab conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	LabtosRGB (ColorValue luvValue)
	converts incoming Lab color to sRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	AdobeRGBtoLab (ColorValue rgbValue)
	converts incoming Adobe RGB color to Lab conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	LabtoAdobeRGB (ColorValue luvValue)
	converts incoming Lab color to Adobe RGB conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	XYZtoLab (ColorValue xyzValue)
	converts incoming XYZ color to Lab conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	LabtoXYZ (ColorValue labValue)
	converts incoming Lab color to XYZ XYZ values are normalized in range 0 to 1 conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white More...

ColorValue	RGBtoCMY (ColorValue rgbValue)
	converts incoming RGB color to CMY Beware, since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them. This indicative implementation is based on the simplest textbook formulae C=1-R; M=1-R and Y=1-B... More...

ColorValue	CMYtoRGB (ColorValue cmyValue)
	converts incoming CMY color to RGB Beware, since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them. This indicative implementation is based on the simplest textbook formulae... More...

ColorValue	RGBtoHSV (ColorValue rgbValue)
	converts incoming RGB color to HSV HSV = Hue, Saturation and Value, according to Travis. H is between 0 and 360 degrees; S and V are between 0 and 1 More...

ColorValue	HSVtoRGB (ColorValue hsvValue)
	converts incoming HSV color to RGB More...

ColorValue	RGBtoHSI (ColorValue rgbValue)
	converts incoming RGB color to HSI HSI = Hue, Saturation and Intensity, according to definition by Gonzalez and Woods. More...

ColorValue	HSItoRGB (ColorValue hsiValue)
	converts incoming HSI color to RGB More...

ColorValue	RGBtoHSL (ColorValue rgbValue)
	converts incoming RGB color to HSL http://www.rapidtables.com/convert/color/rgb-to-hsl.htm HSL = Hue, Saturation and Lightness H=[0..360] S=[0..1] L=[0..1] More...

ColorValue	HSLtoRGB (ColorValue hslValue)
	converts incoming HSL color to RGB More...

ColorValue	LabtoLCH (ColorValue labValue)
	converts incoming Lab color to LCH More...

ColorValue	LCHtoLab (ColorValue lchValue)
	converts incoming LCH color to Lab More...

ColorValue	SpectralValuesToXYZ (double *pSpectralValuesArray, int wavelengthMin, int wavelengthMax)
	Converts from spectral data to XYZ, default with reference illuminant D50 Calculation of tristimulus values from spectral data at 10nm intervals according to the "CIE Method" See: http://www.digitalcolour.org/understanding/Tristimulus.htms. More...

ColorValue	SpectralValuesToLab (double *pSpectralValuesArray, int wavelengthMin, int wavelengthMax)
	Converts from spectral data to Lab, default with reference illuminant D50 Calculation of tristimulus values from spectral data at 10nm intervals according to the "CIE Method" See: http://www.digitalcolour.org/understanding/Tristimulus.htms. More...

double	DeltaE1976 (ColorValue lab1, ColorValue lab2)
	computes difference between two colours in Lab space according to 1976 formulation http://en.wikipedia.org/wiki/Color_difference More...

double	DeltaE1994 (ColorValue lab1, ColorValue lab2)
	computes difference between two colours in Lab space according to 1994 formulation http://en.wikipedia.org/wiki/Color_difference More...

double	DeltaE2000 (ColorValue lab1, ColorValue lab2)
	computes difference between two colours in Lab space according to 2000 formulation http://www.brucelindbloom.com/index.html?Eqn_DeltaE_CIE2000.html More...

double	DeltaE2000 (double pSpectralValues1, double pSpectralValues2, int wavelengthMin, int wavelengthMax)
	computes difference between two colours expressed as arrays of spectral values to delta E 2000 formulation http://www.brucelindbloom.com/index.html?Eqn_DeltaE_CIE2000.html More...

Static Public Member Functions
static ColorValue	RGBtoYUV (ColorValue rgbValue)
	converts incoming RGB color to YUV In fact European R'G'B' to Y'U'V' for non-linear signals. The YUV standard (also called CCIR 601), known before as YCrCb (Y Cr Cb), is a colour representation model dedicated to analogue video. Equation (73) in http://www.poynton.com/PDFs/coloureq.pdf or formula on http://en.wikipedia.org/wiki/YUV More...

static ColorValue	YUVtoRGB (ColorValue yuvValue)
	converts incoming YUV color to RGB In fact European Y'U'V' to R'G'B' for non-linear signals. The YUV standard (also called CCIR 601), known before as YCrCb (Y Cr Cb), is a colour representation model dedicated to analogue video. Equation (74) in http://www.poynton.com/PDFs/coloureq.pdf or formula on http://en.wikipedia.org/wiki/YUV More...

static double	RGBToGray (ColorValue rgbValue)
	Computes for an RGB triplet the corresponding gray value. More...

static ColorValue	RGBToSepia (ColorValue rgbValue)
	converts an RGB color into its corresponding sepia color Sepia tone refers to the coloring of grayscale images to simulate the faded brownish color of some early photographs: http://blogs.techrepublic.com.com/howdoi/?p=120 warning: do not use NORMAL_OUT when writing result to disk, because this will make the image appear gray instead of sepia since its scales all channels independently More...

static ColorValue	RGBToSepia2 (ColorValue rgbValue)
	converts an RGB color into its corresponding sepia color (alternative method) www.wvutech.edu/mclark/CSCI121-2006/Lectures/ConditionalStatements.pdf More...

static ColorValue	RGBToSepia2 (double grayValue)
	converts a gray value into its corresponding sepia color (same as above, but with grayscale input) www.wvutech.edu/mclark/CSCI121-2006/Lectures/ConditionalStatements.pdf More...

Detailed Description

transformations between color spaces

If used with standard settings (reference white point D65; RGB in range 0-255), the static member functions can be used without object. If however different settings are required, you MUST first create a Color object and set the appropriate variables.

References: http://www.poynton.com/PDFs/coloureq.pdf HSI: Digital Image Processing Using MATLAB (DIPUM) by Gonzalez, Woods, and Eddins http://www.imageprocessingplace.com/ HSV: http://nl.wikipedia.org/wiki/HSV_(kleurruimte) XYZ: http://www.brucelindbloom.com/ Delta E and reference white points: http://www.digitalcolour.org/toolbox.htm Illuminants: Danny Pascale. "A Review of RGB color spaces". Babel Color. "http://www.babelcolor.com/download/A review of RGB color spaces.pdf".

Member Function Documentation

ColorValue stira::imagedata::TransformColorSpace::AdobeRGBtoLab ( ColorValue rgbValue )

converts incoming Adobe RGB color to Lab conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

rgbValue incoming RGB color

ColorValue stira::imagedata::TransformColorSpace::AdobeRGBtoXYZ ( ColorValue rgbValue )

converts incoming AdobeRGB color to XYZ conversion coefficients and formulae from http://www.brucelindbloom.com/ XYZ values are normalized in range 0 to 1

Parameters

rgbValue incoming RGB color

References stira::imagedata::ColorValue::c, stira::common::MathUtils::ClipValue(), and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::AdobeRGBToXYZ().

ColorValue stira::imagedata::TransformColorSpace::CMYtoRGB ( ColorValue cmyValue )

converts incoming CMY color to RGB Beware, since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them. This indicative implementation is based on the simplest textbook formulae...

Parameters

cmyValue incoming CMY color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::CMYToRGB().

double stira::imagedata::TransformColorSpace::DeltaE1976	(	ColorValue	lab1,
		ColorValue	lab2
	)

computes difference between two colours in Lab space according to 1976 formulation http://en.wikipedia.org/wiki/Color_difference

Parameters

lab1	first colour
lab2	second colour

References stira::imagedata::ColorValue::c.

double stira::imagedata::TransformColorSpace::DeltaE1994	(	ColorValue	lab1,
		ColorValue	lab2
	)

computes difference between two colours in Lab space according to 1994 formulation http://en.wikipedia.org/wiki/Color_difference

Parameters

lab1	first colour
lab2	second colour

References stira::imagedata::ColorValue::c.

double stira::imagedata::TransformColorSpace::DeltaE2000	(	ColorValue	lab1,
		ColorValue	lab2
	)

computes difference between two colours in Lab space according to 2000 formulation http://www.brucelindbloom.com/index.html?Eqn_DeltaE_CIE2000.html

Parameters

lab1	first colour
lab2	second colour

References stira::imagedata::ColorValue::c.

Referenced by stira::imagedata::ProfileCorrect::FindClosestGridPoint(), and stira::imagedata::ProfileCorrect::FindNearestNeighbors().

double stira::imagedata::TransformColorSpace::DeltaE2000	(	double *	pSpectralValues1,
		double *	pSpectralValues2,
		int	wavelengthMin,
		int	wavelengthMax
	)

computes difference between two colours expressed as arrays of spectral values to delta E 2000 formulation http://www.brucelindbloom.com/index.html?Eqn_DeltaE_CIE2000.html

Parameters

pSpectralValues1	spectral data for first colour (step size 10nm).
pSpectralValues2	spectral data for second colour (step size 10nm).
wavelengthMin	lowest wavelength (min. 380nm).
wavelengthMax	highest wavelength (max. 770nm).

ColorValue stira::imagedata::TransformColorSpace::HSItoRGB ( ColorValue hsiValue )

converts incoming HSI color to RGB

Parameters

hsiValue incoming HSI color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::HSIToRGB().

ColorValue stira::imagedata::TransformColorSpace::HSLtoRGB ( ColorValue hslValue )

converts incoming HSL color to RGB

Parameters

hslValue incoming HSL color

References stira::imagedata::ColorValue::c.

Referenced by stira::imagedata::Image::HSLToRGB().

ColorValue stira::imagedata::TransformColorSpace::HSVtoRGB ( ColorValue hsvValue )

converts incoming HSV color to RGB

Parameters

hsvValue incoming HSV color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::ApplyPoissonNoise(), stira::imagetools::FractalGenerator::GetMathWidth(), and stira::imagedata::Image::HSVToRGB().

ColorValue stira::imagedata::TransformColorSpace::LabtoAdobeRGB ( ColorValue luvValue )

converts incoming Lab color to Adobe RGB conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

labValue incoming Lab color

ColorValue stira::imagedata::TransformColorSpace::LabtoLCH ( ColorValue labValue )

converts incoming Lab color to LCH

Parameters

labValue incoming Lab color

References stira::common::MathUtils::ApplyModulo(), stira::imagedata::ColorValue::c, and stira::common::MathUtils::ToDegrees().

ColorValue stira::imagedata::TransformColorSpace::LabtosRGB ( ColorValue luvValue )

converts incoming Lab color to sRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

labValue incoming Lab color

Referenced by stira::imagetools::GretagMacbethColorChecker::Generate(), and stira::imagedata::Image::LabTosRGB().

ColorValue stira::imagedata::TransformColorSpace::LabtoXYZ ( ColorValue labValue )

converts incoming Lab color to XYZ XYZ values are normalized in range 0 to 1 conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

labValue incoming Lab color

References stira::imagedata::ColorValue::c, stira::imagedata::ColorConstants::sEpsilon, stira::imagedata::ColorConstants::sKappa, and stira::imagedata::ColorValue::type.

Referenced by stira::imagetools::ChromaticAdaptation::AdaptLabColor().

ColorValue stira::imagedata::TransformColorSpace::LCHtoLab ( ColorValue lchValue )

converts incoming LCH color to Lab

Parameters

labValue incoming LCH color

References stira::imagedata::ColorValue::c, and stira::common::MathUtils::ToRadians().

ColorValue stira::imagedata::TransformColorSpace::LuvtosRGB ( ColorValue luvValue )

converts incoming Luv color to sRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

luvValue incoming Luv color

Referenced by stira::imagedata::Image::LuvTosRGB().

ColorValue stira::imagedata::TransformColorSpace::LuvtoXYZ ( ColorValue luvValue )

converts incoming Luv color to XYZ XYZ values are normalized in range 0 to 1 conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

luvValue incoming Luv color

References stira::imagedata::ColorValue::c, stira::imagedata::ColorConstants::sEpsilon, stira::imagedata::ColorConstants::sKappa, and stira::imagedata::ColorValue::type.

ColorValue stira::imagedata::TransformColorSpace::RGBtoCMY ( ColorValue rgbValue )

converts incoming RGB color to CMY Beware, since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them. This indicative implementation is based on the simplest textbook formulae C=1-R; M=1-R and Y=1-B...

Parameters

rgbValue incoming RGB color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::RGBToCMY().

double stira::imagedata::TransformColorSpace::RGBToGray ( ColorValue rgbValue )

static

Computes for an RGB triplet the corresponding gray value.

Parameters

rgbValue the input RGB triplet

References stira::imagedata::ColorValue::c.

Referenced by stira::imagetools::ImageTools::ConvertToGrayImage().

ColorValue stira::imagedata::TransformColorSpace::RGBtoHSI ( ColorValue rgbValue )

converts incoming RGB color to HSI HSI = Hue, Saturation and Intensity, according to definition by Gonzalez and Woods.

Parameters

rgbValue incoming RGB color

References stira::imagedata::ColorValue::c, stira::imagedata::ColorValue::GetMin(), and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::RGBToHSI().

ColorValue stira::imagedata::TransformColorSpace::RGBtoHSL ( ColorValue rgbValue )

converts incoming RGB color to HSL http://www.rapidtables.com/convert/color/rgb-to-hsl.htm HSL = Hue, Saturation and Lightness H=[0..360] S=[0..1] L=[0..1]

Parameters

rgbValue incoming RGB color

References stira::imagedata::ColorValue::c, stira::imagedata::ColorValue::GetMax(), stira::imagedata::ColorValue::GetMin(), and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::RGBToHSL().

ColorValue stira::imagedata::TransformColorSpace::RGBtoHSV ( ColorValue rgbValue )

converts incoming RGB color to HSV HSV = Hue, Saturation and Value, according to Travis. H is between 0 and 360 degrees; S and V are between 0 and 1

Parameters

rgbValue incoming YUV color

References stira::imagedata::ColorValue::c, stira::imagedata::ColorValue::GetMax(), stira::imagedata::ColorValue::GetMin(), and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::ApplyPoissonNoise(), and stira::imagedata::Image::RGBToHSV().

ColorValue stira::imagedata::TransformColorSpace::RGBToSepia ( ColorValue rgbValue )

static

converts an RGB color into its corresponding sepia color Sepia tone refers to the coloring of grayscale images to simulate the faded brownish color of some early photographs: http://blogs.techrepublic.com.com/howdoi/?p=120 warning: do not use NORMAL_OUT when writing result to disk, because this will make the image appear gray instead of sepia since its scales all channels independently

Parameters

rgbValue the input RGB triplet

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

ColorValue stira::imagedata::TransformColorSpace::RGBToSepia2 ( ColorValue rgbValue )

static

converts an RGB color into its corresponding sepia color (alternative method) www.wvutech.edu/mclark/CSCI121-2006/Lectures/ConditionalStatements.pdf

Parameters

rgbValue the input RGB triplet

Referenced by stira::imagetools::ImageTools::ConvertToSepiaImage().

ColorValue stira::imagedata::TransformColorSpace::RGBToSepia2 ( double grayValue )

static

converts a gray value into its corresponding sepia color (same as above, but with grayscale input) www.wvutech.edu/mclark/CSCI121-2006/Lectures/ConditionalStatements.pdf

Parameters

grayValue the input gray value

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

ColorValue stira::imagedata::TransformColorSpace::RGBtoYUV ( ColorValue rgbValue )

static

converts incoming RGB color to YUV In fact European R'G'B' to Y'U'V' for non-linear signals. The YUV standard (also called CCIR 601), known before as YCrCb (Y Cr Cb), is a colour representation model dedicated to analogue video. Equation (73) in http://www.poynton.com/PDFs/coloureq.pdf or formula on http://en.wikipedia.org/wiki/YUV

Parameters

rgbValue incoming RGB color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::RGBToYUV().

ColorValue stira::imagedata::TransformColorSpace::SpectralValuesToLab	(	double *	pSpectralValuesArray,
		int	wavelengthMin,
		int	wavelengthMax
	)

Converts from spectral data to Lab, default with reference illuminant D50 Calculation of tristimulus values from spectral data at 10nm intervals according to the "CIE Method" See: http://www.digitalcolour.org/understanding/Tristimulus.htms.

The reason for the choice of D50 is that we also need the spectral reflectances of the illuminant.

Parameters

pSpectralValuesArray	spectral data (step size 10nm).
wavelengthMin	lowest wavelength (min. 380nm).
wavelengthMax	highest wavelength (max. 770nm).

Returns: Lab value (using D50).

ColorValue stira::imagedata::TransformColorSpace::SpectralValuesToXYZ	(	double *	pSpectralValuesArray,
		int	wavelengthMin,
		int	wavelengthMax
	)

Converts from spectral data to XYZ, default with reference illuminant D50 Calculation of tristimulus values from spectral data at 10nm intervals according to the "CIE Method" See: http://www.digitalcolour.org/understanding/Tristimulus.htms.

The reason for the choice of D50 is that we also need the spectral reflectances of the illuminant.

Parameters

pSpectralValuesArray	spectral data (step size 10nm).
wavelengthMin	lowest wavelength (min. 380nm).
wavelengthMax	highest wavelength (max. 770nm).

Returns: XYZ value in range 0 to 100 (using D50).

ColorValue stira::imagedata::TransformColorSpace::sRGBtoLab ( ColorValue rgbValue )

converts incoming sRGB color to Lab conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

rgbValue incoming RGB color

Referenced by stira::imagedata::Image::sRGBToLab().

ColorValue stira::imagedata::TransformColorSpace::sRGBtoLuv ( ColorValue rgbValue )

converts incoming sRGB color to Luv conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

rgbValue incoming RGB color

Referenced by stira::imagedata::Image::sRGBToLuv().

ColorValue stira::imagedata::TransformColorSpace::sRGBtoXYZ ( ColorValue rgbValue )

converts incoming sRGB color to XYZ conversion coefficients and formulae from http://www.brucelindbloom.com/ XYZ values are normalized in range 0 to 1

Parameters

rgbValue incoming RGB color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagetools::ChromaticAdaptation::AdaptsRGBColor(), and stira::imagedata::Image::sRGBToXYZ().

ColorValue stira::imagedata::TransformColorSpace::XYZtoAdobeRGB ( ColorValue xyzValue )

converts incoming XYZ color to AdobeRGB conversion coefficients and formulae from http://www.brucelindbloom.com/

Parameters

xyzValue incoming XYZ color in range 0 to 1

References stira::imagedata::ColorValue::c, stira::common::MathUtils::ClipValue(), and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::XYZToAdobeRGB().

ColorValue stira::imagedata::TransformColorSpace::XYZtoLab ( ColorValue xyzValue )

converts incoming XYZ color to Lab conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

xyzValue incoming XYZ color in range 0 to 1

References stira::imagedata::ColorValue::c, stira::imagedata::ColorConstants::sEpsilon, stira::imagedata::ColorConstants::sKappa, and stira::imagedata::ColorValue::type.

Referenced by stira::imagetools::ChromaticAdaptation::AdaptLabColor().

ColorValue stira::imagedata::TransformColorSpace::XYZtoLuv ( ColorValue xyzValue )

converts incoming XYZ color to Luv conversion coefficients and formulae from http://www.brucelindbloom.com/ WARNING: default, we use D65 as reference white; use TransformColorSpace as an object instead of directly calling this static method to be able to set a different reference white

Parameters

xyzValue incoming XYZ color in range 0 to 1

References stira::imagedata::ColorValue::c, stira::imagedata::ColorConstants::sEpsilon, stira::imagedata::ColorConstants::sKappa, and stira::imagedata::ColorValue::type.

ColorValue stira::imagedata::TransformColorSpace::XYZtosRGB ( ColorValue xyzValue )

converts incoming XYZ color to sRGB conversion coefficients and formulae from http://www.brucelindbloom.com/ XYZ values are normalized in range 0 to 1

Parameters

xyzValue incoming XYZ color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagetools::ChromaticAdaptation::AdaptsRGBColor(), and stira::imagedata::Image::XYZTosRGB().

ColorValue stira::imagedata::TransformColorSpace::YUVtoRGB ( ColorValue yuvValue )

static

converts incoming YUV color to RGB In fact European Y'U'V' to R'G'B' for non-linear signals. The YUV standard (also called CCIR 601), known before as YCrCb (Y Cr Cb), is a colour representation model dedicated to analogue video. Equation (74) in http://www.poynton.com/PDFs/coloureq.pdf or formula on http://en.wikipedia.org/wiki/YUV

Parameters

yuvValue incoming YUV color

References stira::imagedata::ColorValue::c, and stira::imagedata::ColorValue::type.

Referenced by stira::imagedata::Image::YUVToRGB().

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

imagedata/color/TransformColorSpace.h
imagedata/color/TransformColorSpace.cpp

Public Member Functions

Static Public Member Functions

Detailed Description

Member Function Documentation