比较全的色彩模式之间的转换算法.doc

比较全的色彩模式之间的转换算法 XYZ — RGB 1.????var_X = X / 100? ?? ???//X from 0 to??95.047? ?? ?(Observer = 2°, Illuminant = D65) 2.????var_Y = Y / 100? ?? ???//Y from 0 to 100.000 3.????var_Z = Z / 100? ?? ???//Z from 0 to 108.883 4.????var_R = var_X *??3.2406 + var_Y * -1.5372 + var_Z * -0.4986 5.????var_G = var_X * -0.9689 + var_Y *牋1.8758 + var_Z *牋0.041586 6.????var_B = var_X *牋0.0557 + var_Y * -0.2040 + var_Z *牋1.057086 7.????if ( var_R 0.0031308 ) var_R = 1.055 * ( var_R ^ ( 1 / 2.4 ) ) - 0.055 8.????else?牋 牋 牋 牋 牋 牋 爒ar_R = 12.92 * var_R * ( var 9.????if ( var_G 0.0031308 ) var_G = 1.055 * ( var_G ^ ( 1 / 2.4 ) ) - 0.055 10.?else?牋 牋 牋 牋 牋 牋 爒ar_G = 12.92 * var_G * ( var 11.?if ( var_B 0.0031308 ) var_B = 1.055 * ( var_B ^ ( 1 / 2.4 ) ) - 0.055 12.?else?牋ar ?? ?? ?? ?? ?? ?var_B = 12.92 * var_B 13.?R = var_R * 255 14.?G = var_G * 255 15.?B = var_B * 255 复制代码 RGB — XYZ 1.????var_R = ( R / 255 )? ?? ???//R from 0 to 255 2.????var_G = ( G / 255 )? ?? ???//G from 0 to 255 3.????var_B = ( B / 255 )? ?? ???//B from 0 to 255 4.????if ( var_R 0.04045 ) var_R = ( ( var_R + 0.055 ) / 1.055 ) ^ 2.4 5.????else?牋 牋 牋 牋 牋 ?var_R = var_R / 12.92r_R + 0 6.????if ( var_G 0.04045 ) var_G = ( ( var_G + 0.055 ) / 1.055 ) ^ 2.4 7.????else?牋 牋 牋 牋 牋 ?var_G = var_G / 12.92r_G + 0 8.????if ( var_B 0.04045 ) var_B = ( ( var_B + 0.055 ) / 1.055 ) ^ 2.4 9.????else?牋 牋 牋 牋 牋 ?var_B = var_B / 12.92r_B + 0 10.?var_R = var_R * 100 11.?var_G = var_G * 100 12.?var_B = var_B * 100 13.?//Observer. = 2? Illuminant = D652 14.?X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805 15.?Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722 16.?Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505 复制代码 XYZ — Yxy 1.????//X from 0 to 95.047? ?? ? Observer. = 2°, Illuminant = D65 2.????//Y from 0 to 100.000 3.????//Z from 0 to 108.883 4.????Y = Y 5.????x = X / ( X + Y + Z ) 6.????y = Y / ( X + Y + Z ) 复制代码 Yxy — XYZ 1.????//Y from 0 to 100 2.????//x from 0 to 1 3.????//y from 0 to 1 4.????X = x * ( Y / y ) 5.???