公式详解 参考文献 ： http://blog.csdn.net/idfaya/article/details/6770414
向作者白哦大十二分的敬意。
因为是做游戏的，所以才会有这方面的需求，我们的引擎采用的脚本是 lua， 我是通过lua将数据转换后为游戏材质属性赋值，因为下面的脚本运行速率并不是太高，所以就先在脚本中实现，方便调试。
--[[ * RGB颜色模型转化为HSV的颜色模型数据 * h,s,v 色相，饱和度， 色调（明度） * 返回值 hsvValue h(0-360),s(0-255) v(0-255) * @param colorRGB 颜色数值{r=0,g=255,b=100,a=255}, 数值部分0-255 ]] function _G.RGBConvertToHSV(colorRGB) local r,g,b = colorRGB.r, colorRGB.g, colorRGB.b; local h,s,v = 0,0,0; local max1 = math.max(r, math.max(g,b)); local min1 = math.min(r, math.min(g,b)); if max1 == min1 then h=0; else if r == max1 then if g >= b then h = 60 * (g-b) / (max1-min1); else h = 60 * (g-b) / (max1-min1) + 360; end end if g == max1 then h = 60 * (b-r)/(max1-min1) + 120; end if b == max1 then h = 60 * (r-g)/(max1-min1) + 240; end end if max1 == 0 then s = 0; else s = (1- min1 / max1) * 255; end v = max1; local hsvValue = { h = h; s = s; v= v; }; return hsvValue; end --[[ * HSV to RGB * h,s,v 色相，饱和度，明度（色调） * 返回值 colorValue 颜色值 （0-1）规范化数值 * @paream colorHSV 颜色数值{h,s,v}, h(0-360) s(0-255) v(0-255) ]] function HSVConvertToRGB( colorHSV ) local cr,cg,cb = 0,0,0; colorHSV.s = colorHSV.s /255; colorHSV.v = colorHSV.v / 255; if( colorHSV.s == 0 ) then cr,cg,cb = colorHSV.v, colorHSV.v, colorHSV.v; else colorHSV.h = colorHSV.h /60; local i = math.floor(colorHSV.h); local f = colorHSV.h - i; local a = colorHSV.v * ( 1 - colorHSV.s ); local b = colorHSV.v * ( 1 - colorHSV.s * f ); local c = colorHSV.v * ( 1 - colorHSV.s * (1 - f ) ); if i== 0 then cr,cg,cb = colorHSV.v, c, a; elseif i == 1 then cr,cg,cb = b, colorHSV.v, a; elseif i == 2 then cr,cg,cb = a, colorHSV.v, c; elseif i == 3 then cr,cg,cb = a, b, colorHSV.v; elseif i == 4 then cr,cg,cb = c, a, colorHSV.v; else cr,cg,cb = colorHSV.v, a, b; end end local rgbValue = {r = cr, g = cg, b= cb, a=1}; return rgbValue; end --[[ *HSL颜色值转换为RGB. * h, s, l 色相，饱和度，亮度 * h(0-360) s(0-255) l(0-255); * 返回的 color 数值 [0,1] * @param hslValue ]] function HSLConvertToRGB(hslValue) local h,s,l = hslValue.h, hslValue.s, hslValue.l; h = h/360; s = s/255; l = l/255; local r, g, b; if s == 0 then r, g, b = l, l, l; else local hue2rgb = function(p, q, t) if t < 0 then t = t +1; end if t > 1 then t = t -1; end if t < 1/6 then return p + (q - p) * 6 * t; end if t < 1/2 then return q; end if t < 2/3 then return p + (q - p) * (2/3 - t) * 6; end return p; end local q = l < 0.5 and l * (1 + s) or l + s - l * s; local p = 2 * l - q; r = hue2rgb(p, q, h + 1/3); g = hue2rgb(p, q, h); b = hue2rgb(p, q, h - 1/3); end local rgbValue = {r = r, g = g, b= b, a=1}; return rgbValue; end
