已知获得的RGB像素值为3维数组，将像素分别存入R、G、B 3个通道 Emgu Image方式读取的图像

    //在背景为img1的图中，设置3块区域为黄色    //设置img1背景    Image<Bgr, Byte> img1 = new Image<Bgr, Byte>(320, 240, new    Bgr(255, 0, 0));    //yellow(0,255,255)    Byte b1 = 255;    Bgr yellow = new Bgr(0, 255, 255);    //方式1：遍历像素位置将[20-60][20-60]的区域设置成黄色    for (int i = 20; i < 60; i++)    {        for (int j = 20; j < 60; j++)        {            img1.Data[i, j, 0] = 0;            img1.Data[i, j, 1] = b1;            img1.Data[i, j, 2] = b1;        }    }    //方式2：利用遍历数组的方式，将[120-160][20-60]的区域设置成黄色    for (int i = 120; i < 160; i++)        {            for (int j = 20; j < 60; j++)            {            img1[i, j] = yellow;            }        }    ////方式3：利用img1.Data数组的方式，将[20-60][100-140]的区域设置撑黄色    byte[, ,] data = img1.Data;    for (int i = 20; i < 60; i++)    {        for (int j = 100; j < 140; j++)        {            //Avoid using c# property inside a loop can have a huge            performance boost            data[i, j, 0] = 0;            data[i, j, 1] = b1;            data[i, j, 2] = b1;        }    }    //显示结果    pictureBox1.Image = img1.ToBitmap();

原文地址：http://blog.csdn.net/cvmat/article/details/53711477