Shader中RGB和HSV的相互转换

最新推荐文章于 2025-05-30 16:22:30 发布

Jo.H

最新推荐文章于 2025-05-30 16:22:30 发布

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分类专栏： shader Unity

本文链接：https://blog.youkuaiyun.com/csdn1987/article/details/107079546

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本文详细介绍了RGB和HSV两种色彩模型的定义及其相互转换的算法。RGB模型基于红、绿、蓝三种基本颜色，而HSV则从色调、饱和度和明度三个维度描述颜色。文章提供了具体的转换公式，并展示了Unity Shader语言中的实现代码。

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RGB中的xyz分别对应r(红色)g(绿色)b(蓝色)

HSV中的xyz分别对应h(色调、颜色)s(饱和度)v(明度)

RGB转化到HSV的算法:
max=max(R,G,B)；
min=min(R,G,B)；
V=max(R,G,B)；
S=(max-min)/max；
if (R = max) H =(G-B)/(max-min)* 60；
if (G = max) H = 120+(B-R)/(max-min)* 60；
if (B = max) H = 240 +(R-G)/(max-min)* 60；
if (H < 0) H = H+ 360；

HSV转化到RGB的算法:
if (s = 0)
R=G=B=V;
else
H /= 60;
i = INTEGER(H);
f = H - i;
a = V * ( 1 - s );
b = V * ( 1 - s * f );
c = V * ( 1 - s * (1 - f ) );
switch(i)
case 0: R = V; G = c; B = a;
case 1: R = b; G = v; B = a;
case 2: R = a; G = v; B = c;
case 3: R = a; G = b; B = v;
case 4: R = c; G = a; B = v;
case 5: R = v; G = a; B = b;

Unity Shader代码

//RGB转换成HSV

   half3 RGBToHSV(half3 RGB)
   {
       half R = RGB.x, G = RGB.y, B = RGB.z;
       half3 hsv;
       half Max = max(R, max(G, B));
       half Min = min(R, max(G, B));
       if (R == Max)
       {
           hsv.x = (G - B) / (Max - Min);
       }
       if (G == Max)
       {
           hsv.x = 2 + (B - R) / (Max - Min);
       }
       if (B == Max)
       {
           hsv.x = 4 + (R - G) / (Max - Min);
       }
       hsv.x = hsv.x * 60.0;
       if (hsv.x < 0)
           hsv.x = hsv.x + 360;
       hsv.z = Max;
       hsv.y = (Max - Min) / Max;
       return hsv;
   }

//HSV转换成RGB

   half3 HSVToRGB(half3 HSV)
   {
       half R, G, B;
       if (HSV.y == 0)
       {
           R = G = B = HSV.z;
       }
       else
       {
           HSV.x = HSV.x / 60.0;
           int i = (int)HSV.x;
           half f = HSV.x - (half)i;
           half a = HSV.z * (1 - HSV.y);
           half b = HSV.z * (1 - HSV.y * f);
           half c = HSV.z * (1 - HSV.y * (1 - f));
           switch (i)
           {
           case 0: R = HSV.z; G = c; B = a;
               break;
           case 1: R = b; G = HSV.z; B = a;
               break;
           case 2: R = a; G = HSV.z; B = c;
               break;
           case 3: R = a; G = b; B = HSV.z;
               break;
           case 4: R = c; G = a; B = HSV.z;
               break;
           default: R = HSV.z; G = a; B = b;
               break;
           }
       }
       return half3(R, G, B);
   }