怀旧色

源码：

void huaijiu(Mat& src,Mat& dst)
{for (int h = 0;h < src.rows;h ++){uchar *d1 = src.ptr<uchar>(h);uchar *d2 = dst.ptr<uchar>(h);for (int w = 0;w < src.cols;w ++){int w3 = 3*w;int r =  d1[w3 + 2];int g = d1[w3 + 1];int b = d1[w3 + 0];int AR =(int)(0.393*r + 0.769*g + 0.189*b);int AG =(int)(0.349*r + 0.686*g + 0.168*b);int AB =(int)(0.272*r + 0.534*g + 0.131*b);AR = AR > 255 ? 255 : AR;AG = AG > 255 ? 255 : AG;AB = AB > 255 ? 255  : AB;d2[w3 + 2] = AR;d2[w3 + 1] = AG;d2[w3 + 0] = AB;}}}

原图： 

冰冻滤镜

void bingdong(Mat& src,Mat& dst)
{for (int h = 0;h < src.rows;h ++){uchar *d1 = src.ptr<uchar>(h);uchar *d2 = dst.ptr<uchar>(h);for (int w = 0;w < src.cols;w ++){int w3 = 3*w;int r =  d1[w3 + 2];int g = d1[w3 + 1];int b = d1[w3 + 0];int AR =(r - b - g)*3/2;int AG =(g - b - r)*3/2;int AB =(b - r - g)*3/2;AR = AR > 255 ? 255 : AR;AG = AG > 255 ? 255 : AG;AB = AB > 255 ? 255  : AB;d2[w3 + 2] = AR;d2[w3 + 1] = AG;d2[w3 + 0] = AB;}}
}

熔铸滤镜

void rongzhu(Mat& src,Mat& dst)
{for (int h = 0;h < src.rows;h ++){uchar *d1 = src.ptr<uchar>(h);uchar *d2 = dst.ptr<uchar>(h);for (int w = 0;w < src.cols;w ++){int w3 = 3*w;int r =  d1[w3 + 2];int g = d1[w3 + 1];int b = d1[w3 + 0];int AR = r * 128 / (b+g+1);int AG = g*128 / (b+r+1);int AB = b*128 / (r+g+1);AR = AR > 255 ? 255 : AR;AG = AG > 255 ? 255 : AG;AB = AB > 255 ? 255  : AB;d2[w3 + 2] = AR;d2[w3 + 1] = AG;d2[w3 + 0] = AB;}}
}