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1、比较全的色彩模式之间的转换算法XYZ RGB1. var_X = X / 100 /X from 0 to 95.047 (Observer = 2, Illuminant = D65)2. var_Y = Y / 100 /Y from 0 to 100.0003. var_Z = Z / 100 /Z from 0 to 108.8834. var_R = var_X * 3.2406 + var_Y * -1.5372 + var_Z * -0.49865. var_G = var_X * -0.9689 + var_Y * 1.8758 + var_Z * 0.04156. var_B
2、 = var_X * 0.0557 + var_Y * -0.2040 + var_Z * 1.05707. if ( var_R 0.0031308 ) var_R = 1.055 * ( var_R ( 1 / 2.4 ) ) - 0.0558. else var_R = 12.92 * var_R9. if ( var_G 0.0031308 ) var_G = 1.055 * ( var_G ( 1 / 2.4 ) ) - 0.05510. else var_G = 12.92 * var_G11. if ( var_B 0.0031308 ) var_B = 1.055 * ( va
3、r_B ( 1 / 2.4 ) ) - 0.05512. else var_B = 12.92 * var_B13. R = var_R * 25514. G = var_G * 25515. B = var_B * 255复制代码RGB XYZ1. var_R = ( R / 255 ) /R from 0 to 2552. var_G = ( G / 255 ) /G from 0 to 2553. var_B = ( B / 255 ) /B from 0 to 2554. if ( var_R 0.04045 ) var_R = ( ( var_R + 0.055 ) / 1.055
4、) 2.45. else var_R = var_R / 12.926. if ( var_G 0.04045 ) var_G = ( ( var_G + 0.055 ) / 1.055 ) 2.47. else var_G = var_G / 12.928. if ( var_B 0.04045 ) var_B = ( ( var_B + 0.055 ) / 1.055 ) 2.49. else var_B = var_B / 12.9210. var_R = var_R * 10011. var_G = var_G * 10012. var_B = var_B * 10013. /Obse
5、rver. = 2, Illuminant = D6514. X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.180515. Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.072216. Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505复制代码XYZ Yxy1. /X from 0 to 95.047 Observer. = 2, Illuminant = D652. /Y from 0 to 100.0003. /Z from 0 to 1
6、08.8834. Y = Y5. x = X / ( X + Y + Z )6. y = Y / ( X + Y + Z )复制代码Yxy XYZ1. /Y from 0 to 1002. /x from 0 to 13. /y from 0 to 14. X = x * ( Y / y )5. Y = Y6. Z = ( 1 - x - y ) * ( Y / y )复制代码XYZ Hunter-Lab1. (H)L = 10 * sqrt( Y )2. (H)a = 17.5 * ( ( ( 1.02 * X ) - Y ) / sqrt( Y ) )3. (H)b = 7 * ( ( Y
7、 - ( 0.847 * Z ) ) / sqrt( Y ) )复制代码Hunter-Lab XYZ1. var_Y = (H)L / 102. var_X = (H)a / 17.5 * (H)L / 103. var_Z = (H)b / 7 * (H)L / 104. Y = var_Y 25. X = ( var_X + Y ) / 1.026. Z = -( var_Z - Y ) / 0.847复制代码XYZ CIE-L*ab1. var_X = X / ref_X /ref_X = 95.047 Observer= 2, Illuminant= D652. var_Y = Y /
8、 ref_Y /ref_Y = 100.0003. var_Z = Z / ref_Z /ref_Z = 108.8834. if ( var_X 0.008856 ) var_X = var_X ( 1/3 )5. else var_X = ( 7.787 * var_X ) + ( 16 / 116 )6. if ( var_Y 0.008856 ) var_Y = var_Y ( 1/3 )7. else var_Y = ( 7.787 * var_Y ) + ( 16 / 116 )8. if ( var_Z 0.008856 ) var_Z = var_Z ( 1/3 )9. els
9、e var_Z = ( 7.787 * var_Z ) + ( 16 / 116 )10. CIE-L* = ( 116 * var_Y ) - 1611. CIE-a* = 500 * ( var_X - var_Y )12. CIE-b* = 200 * ( var_Y - var_Z )复制代码CIE-L*ab XYZ1. var_Y = ( CIE-L* + 16 ) / 1162. var_X = CIE-a* / 500 + var_Y3. var_Z = var_Y - CIE-b* / 2004. if ( var_Y3 0.008856 ) var_Y = var_Y35.
10、else var_Y = ( var_Y - 16 / 116 ) / 7.7876. if ( var_X3 0.008856 ) var_X = var_X37. else var_X = ( var_X - 16 / 116 ) / 7.7878. if ( var_Z3 0.008856 ) var_Z = var_Z39. else var_Z = ( var_Z - 16 / 116 ) / 7.78710. X = ref_X * var_X /ref_X = 95.047 Observer= 2, Illuminant= D6511. Y = ref_Y * var_Y /re
11、f_Y = 100.00012. Z = ref_Z * var_Z /ref_Z = 108.883复制代码CIE-L*ab CIE-L*CH1. var_H = arc_tangent( CIE-b*, CIE-a* ) /Quadrant by signs2. if ( var_H 0 ) var_H = ( var_H / PI ) * 1803. else var_H = 360 - ( abs( var_H ) / PI ) * 1804. CIE-L* = CIE-L*5. CIE-C* = sqrt( CIE-a* 2 + CIE-b* 2 )6. CIE-H = var_H复
12、制代码CIE-L*CH CIE-L*ab1. /CIE-H from 0 to 3602. CIE-L* = CIE-L*3. CIE-a* = cos( degree_2_radian( CIE-H ) ) * CIE-C*4. CIE-b* = sin( degree_2_radian( CIE-H ) ) * CIE-C*复制代码XYZ CIE-L*uv1. var_U = ( 4 * X ) / ( X + ( 15 * Y ) + ( 3 * Z ) )2. var_V = ( 9 * Y ) / ( X + ( 15 * Y ) + ( 3 * Z ) )3. var_Y = Y
13、/ 1004. if ( var_Y 0.008856 ) var_Y = var_Y ( 1/3 )5. else var_Y = ( 7.787 * var_Y ) + ( 16 / 116 )6. ref_X = 95.047 /Observer= 2, Illuminant= D657. ref_Y = 100.0008. ref_Z = 108.8839. ref_U = ( 4 * ref_X ) / ( ref_X + ( 15 * ref_Y ) + ( 3 * ref_Z ) )10. ref_V = ( 9 * ref_Y ) / ( ref_X + ( 15 * ref_
14、Y ) + ( 3 * ref_Z ) )11. CIE-L* = ( 116 * var_Y ) - 1612. CIE-u* = 13 * CIE-L* * ( var_U - ref_U )13. CIE-v* = 13 * CIE-L* * ( var_V - ref_V )复制代码CIE-L*uv XYZ1. var_Y = ( CIE-L* + 16 ) / 1162. if ( var_Y3 0.008856 ) var_Y = var_Y33. else var_Y = ( var_Y - 16 / 116 ) / 7.7874. ref_X = 95.047 /Observer=
