颜色模型互转 rgb hsl lab hsv

/* * ColorSpace.cpp * * Created on: 2016年7月1日 * Author: Administrator */ #include "stdafx.h" #include "ColorSpace.hpp" #include <iostream> using namespace std; #define MAX2(a, b) ( (a) > (b) ) ? (a) : (b) #define MAX3(a,b,c) ( ( (a) > (b) ) ? MAX2( a, c) : MAX2( b, c ) ) #define MIN2(a, b) ( (a) < (b) ) ? (a) : (b) #define MIN3(a,b,c) ( ( (a) < (b) ) ? MIN2( a, c ) : MIN2( b, c ) ) #define SWAP(a, b, t) do { t = a; a = b; b = t; } while(0) #define CLIP_RANGE(value, min, max) ( (value) > (max) ? (max) : (((value) < (min)) ? (min) : (value)) ) #define COLOR_RANGE(value) CLIP_RANGE(value, 0, 255) namespace cv { /** * Convert BGR to Lab * * @param bgr [in] pointer to pixel data in Blue-Green-Red format, each channel's value range [0, 255] * @param lab [out] pointer to pixel data in L-a-b format * L, value range [0, 1] * a, value range [0, 1] * b, value range [0, 1] */ void BGR2Lab(const uchar *bgr, float *lab) //void rgb2lab( float R, float G, float B, float & l_s, float &a_s, float &b_s ) { float var_R = bgr[2] /255.0; float var_G = bgr[1] /255.0; float var_B = bgr[0] /255.0; if ( var_R > 0.04045 ) var_R = pow( (( var_R + 0.055 ) / 1.055 ), 2.4 ); else var_R = var_R / 12.92; if ( var_G > 0.04045 ) var_G = pow( ( ( var_G + 0.055 ) / 1.055 ), 2.4); else var_G = var_G / 12.92; if ( var_B > 0.04045 ) var_B = pow( ( ( var_B + 0.055 ) / 1.055 ), 2.4); else var_B = var_B / 12.92; var_R = var_R * 100.; var_G = var_G * 100.; var_B = var_B * 100.; //Observer. = 2°, Illuminant = D65 float X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805; float Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722; float Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505; float var_X = X / 95.047 ; //ref_X = 95.047 Observer= 2°, Illuminant= D65 float var_Y = Y / 100.000; //ref_Y = 100.000 float var_Z = Z / 108.883; //ref_Z = 108.883 if ( var_X > 0.008856 ) var_X = pow(var_X , ( 1./3. ) ); else var_X = ( 7.787 * var_X ) + ( 16. / 116. ); if ( var_Y > 0.008856 ) var_Y = pow(var_Y , ( 1./3. )); else var_Y = ( 7.787 * var_Y ) + ( 16. / 116. ); if ( var_Z > 0.008856 ) var_Z = pow(var_Z , ( 1./3. )); else var_Z = ( 7.787 * var_Z ) + ( 16. / 116. ); lab[0] = ( 116. * var_Y ) - 16.; lab[1] = 500. * ( var_X - var_Y ); lab[2] = 200. * ( var_Y - var_Z ); } /** * Convert Lab to BGR * * @param lab [in] pointer to pixel data in L-a-b format * L, value range [0, 1] * a, value range [0, 1] * b, value range [0, 1] * @param bgr [out] pointer to pixel data in Blue-Green-Red format, each channel's value range [0, 255] */ void Lab2BGR(const float *lab, uchar *bgr) //http://www.easyrgb.com/index.php?X=MATH&H=08#text8 //void lab2rgb( float l_s, float a_s, float b_s, float& R, float& G, float& B ) { float var_Y = ( lab[0] + 16. ) / 116.; float var_X = lab[1] / 500. + var_Y; float var_Z = var_Y - lab[2] / 200.; if ( pow(var_Y,3) > 0.008856 ) var_Y = pow(var_Y,3); else var_Y = ( var_Y - 16. / 116. ) / 7.787; if ( pow(var_X,3) > 0.008856 ) var_X = pow(var_X,3); else var_X = ( var_X - 16. / 116. ) / 7.787; if ( pow(var_Z,3) > 0.008856 ) var_Z = pow(var_Z,3); else var_Z = ( var_Z - 16. / 116. ) / 7.787; float X = 95.047 * var_X ; //ref_X = 95.047 Observer= 2°, Illuminant= D65 float Y = 100.000 * var_Y ; //ref_Y = 100.000 float Z = 108.883 * var_Z ; //ref_Z = 108.883 var_X = X / 100. ; //X from 0 to 95.047 (Observer = 2°, Illuminant = D65) var_Y = Y / 100. ; //Y from 0 to 100.000 var_Z = Z / 100. ; //Z from 0 to 108.883 float var_R = var_X * 3.2406 + var_Y * -1.5372 + var_Z * -0.4986; float var_G = var_X * -0.9689 + var_Y * 1.8758 + var_Z * 0.0415; float var_B = var_X * 0.0557 + var_Y * -0.2040 + var_Z * 1.0570; if ( var_R > 0.0031308 ) var_R = 1.055 * pow(var_R , ( 1 / 2.4 )) - 0.055; else var_R = 12.92 * var_R; if ( var_G > 0.0031308 ) var_G = 1.055 * pow(var_G , ( 1 / 2.4 ) ) - 0.055; else var_G = 12.92 * var_G; if ( var_B > 0.0031308 ) var_B = 1.055 * pow( var_B , ( 1 / 2.4 ) ) - 0.055; else var_B = 12.92 * var_B; bgr[2] = var_R * 255.; bgr[1] = var_G * 255.; bgr[0] = var_B * 255.; } /** * Convert RGB to Lab * * @param R [in] red, value range [0, 255] * @param G [in] green, value range [0, 255] * @param B [in] blue, value range [0, 255] * @param L [out] L, value range [0, 1] * @param a [out] a, value range [0, 1] * @param b [out] b, value range [0, 1] */ void RGB2Lab(uchar R, uchar G, uchar B, float *L, float *a, float *b) { float lab[3]; uchar bgr[3]; bgr[0] = B; bgr[1] = G; bgr[2] = R; BGR2Lab(bgr, lab); *L = lab[0]; *a = lab[1]; *b = lab[2]; } /** * Convert Lab to RGB * * @param L [in] L, value range [0, 1] * @param a [in] a, value range [0, 1] * @param b [in] b, value range [0, 1] * @param R [out] red, value range [0, 255] * @param G [out] green, value range [0, 255] * @param B [out] blue, value range [0, 255] */ void Lab2RGB(float L, float a, float b, uchar *R, uchar *G, uchar *B) { float lab[3]; uchar bgr[3]; lab[0] = L; lab[1] = a; lab[2] = b; Lab2BGR(lab, bgr); *R = bgr[2]; *G = bgr[1]; *B = bgr[0]; } /** * Convert RGB to CMYK * * @param bgr [in] pointer to pixel data in Blue-Green-Red format, each channel's value range [0, 255] * @param cmyk [out] pointer to pixel data in Cyan-Magenta-Yellow-Black format * cyan, value range [0, 1] * magenta, value range [0, 1] * yellow, value range [0, 1] * black, value range [0, 1] */ void BGR2CMYK(const uchar *bgr, float *cmyk) { float r1 = bgr[2] / 255.0; float g1 = bgr[1] / 255.0; float b1 = bgr[0] / 255.0; cmyk[3] = 1 - MAX3(r1, g1, b1); cmyk[0] = (1 - r1 - cmyk[3]) / (1 - cmyk[3]); cmyk[1] = (1 - g1 - cmyk[3]) / (1 - cmyk[3]); cmyk[2] = (1 - b1 - cmyk[3]) / (1 - cmyk[3]); } /** * Convert CYMK to BGR * * @param cmyk [in] pointer to pixel data in Cyan-Magenta-Yellow-Black format * cyan, value range [0, 1] * magenta, value range [0, 1] * yellow, value range [0, 1] * black, value range [0, 1] * @param bgr [out] pointer to pixel data in Blue-Green-Red format, each channel's value range [0, 255] */ void CMYK2BGR(const float *cmyk, uchar *bgr) { bgr[2] = cvRound(255.0 * (1 - cmyk[0]) * (1 - cmyk[3])); bgr[1] = cvRound(255.0 * (1 - cmyk[1]) * (1 - cmyk[3])); bgr[0] = cvRound(255.0 * (1 - cmyk[2]) * (1 - cmyk[3])); } /** * Convert RGB to CMYK * * @param R [in] red, value range [0, 255] * @param G [in] green, value range [0, 255] * @param B [in] blue, value range [0, 255] * @param C [out] cyan, value range [0, 1] * @param M [out] magenta, value range [0, 1] * @param Y [out] yellow, value range [0, 1] * @param K [out] black, value range [0, 1] */ void RGB2CMYK(uchar R, uchar G, uchar B, float *C, float *M, float *Y, float *K) { float cmyk[4]; uchar bgr[3]; bgr[0] = B; bgr[1] = G; bgr[2] = R; BGR2CMYK(bgr, cmyk); *C = cmyk[0]; *M = cmyk[1]; *Y = cmyk[2]; *K = cmyk[3]; } /** * Convert CMYK to RGB * * @param C [in] cyan, value range [0, 1] * @param M [in] magenta, value range [0, 1] * @param Y [in] yellow, value range [0, 1] * @param K [in] black, value range [0, 1] * @param R [out] red, value range [0, 25