OpenCV Mat 访问 修改像素数据

#include
#include
#include
#include
#include

using namespace cv;
using namespace std;
int main(int argc, char** args)
{
Mat image = imread(“test.jpg”);
if (image.empty())
{
cout << “不能加载图像…” << std::endl;
return -1;
}

Mat dst;
cvtColor(image, dst, CV_BGR2GRAY);

int height = image.rows;
int width = image.cols;
int channels = image.channels();
printf("height=%d,width=%d channels=%d",height,width,channels);


for (int row = 0; row < height;row++)
{
	for (int col = 0; col < width;col++)
	{
		if (channels==3)
		{
			//image.at(row, col)[0] = 0;//blue 通道
			//image.at(row, col)[1] = 0;//green 通道
			//image.at(row, col)[2] = 255 - image.at(row, col)[2];// red 通道

			//image.at(row, col)[0] = 255 - image.at(row, col)[0];//blue 通道
			//image.at(row, col)[1] = 255 - image.at(row, col)[1];//green 通道
			//image.at(row, col)[2] = 255 - image.at(row, col)[2];// red 通道

			image.at(row, col)[0] = 0;//blue 通道
			image.at(row, col)[1] = 255 - image.at(row, col)[1];//green 通道
			image.at(row, col)[2] = 0;// red 通道

			//image.at(row, col)[1] = 0;//green 通道
			//image.at(row, col)[2] = 0;// red 通道

		}
		//else if (channels==1)
		//{
		//	dst.at(row, col) = 255 - dst.at(row, col);
		//}
	}
}
namedWindow("输出图像-2", CV_WINDOW_AUTOSIZE);
imshow("输出图像-2", image);
waitKey(0);
return 0;

}