我知道这个has already been asked ,但那里给出的答案不起作用。我花了一个多小时寻找公式或算法,但一无所获。因此,我开始编写自己的算法,以尽可能最有效的方式将 RGB 转换为 RGBW。这是我目前得到的:
//'Ri', 'Gi', and 'Bi' correspond to the Red, Green, and Blue inputs.
var M = Math.Max(Ri, Math.Max(Gi, Bi)); //The maximum value between R,G, and B.
int Wo =0; //White output
int Ro=0; //Red output
int Go=0; //Green output
int Bo=0; //Blue output
int av = 0; //Average between the two minimum values
int hR = 0; //Red with 100% hue
int hG = 0; //Green with 100% hue
int hB = 0; //Blue with 100% hue
//These 4 lines serve to figure out what the input color is with 100% hue.
float multiplier = 255.0f / M;
hR = Convert.ToInt32(Ri * multiplier);
hG = Convert.ToInt32(Gi * multiplier);
hB = Convert.ToInt32(Bi * multiplier);
//Depending on the maximum value, get an average of the least used colors, weighted for their importance in the overall hue.
//This is the problematic part
if (M == Ri)
av = (Bi*hB + Gi*hG) / (hB+hG);
else if (M == Gi)
av = (Ri*hR + Bi*hB) / (hR+hB);
else if (M == Bi)
av = (Gi*hG + Ri*hR) / (hG+hR);
//Set the rgbw colors
Wo = av;
Bo = Bi - av;
Ro = Ri - av;
Go = Gi - av;
if (Wo < 1) Wo = 0;
if (Bo < 1) Bo = 0;
if (Ro < 1) Ro = 0;
if (Go < 1) Go = 0;
if (Wo > 255) Wo = 255;
if (Bo > 255) Bo = 255;
if (Ro > 255) Ro = 255;
if (Go > 255) Go = 255;
如果我处理的颜色是原色,它工作正常,但在任何其他情况下都不是。是什么让它无处不在?我走在正确的轨道上吗?
最佳答案
我终于想通了如何将 RGB 转换为 RGBW,原来我以前的方法是完全错误的:
//Get the maximum between R, G, and B
float tM = Math.Max(Ri, Math.Max(Gi, Bi));
//If the maximum value is 0, immediately return pure black.
if(tM == 0)
{ return new rgbwcolor() { r = 0, g = 0, b = 0, w = 0 }; }
//This section serves to figure out what the color with 100% hue is
float multiplier = 255.0f / tM;
float hR = Ri * multiplier;
float hG = Gi * multiplier;
float hB = Bi * multiplier;
//This calculates the Whiteness (not strictly speaking Luminance) of the color
float M = Math.Max(hR, Math.Max(hG, hB));
float m = Math.Min(hR, Math.Min(hG, hB));
float Luminance = ((M + m) / 2.0f - 127.5f) * (255.0f/127.5f) / multiplier;
//Calculate the output values
int Wo = Convert.ToInt32(Luminance);
int Bo = Convert.ToInt32(Bi - Luminance);
int Ro = Convert.ToInt32(Ri - Luminance);
int Go = Convert.ToInt32(Gi - Luminance);
//Trim them so that they are all between 0 and 255
if (Wo < 0) Wo = 0;
if (Bo < 0) Bo = 0;
if (Ro < 0) Ro = 0;
if (Go < 0) Go = 0;
if (Wo > 255) Wo = 255;
if (Bo > 255) Bo = 255;
if (Ro > 255) Ro = 255;
if (Go > 255) Go = 255;
return new rgbwcolor() { r = Ro, g = Go, b = Bo, w = Wo };
任何优化想法都非常受欢迎:)
关于c# - 将 RGB 转换为 RGBW,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40312216/