OpenCV默认颜色通道

网上查了一下，OpenCV读取图片之后Mat默认的颜色通道都说是BGR，有点不信，试了一下，先用PS做一张纯色的图片，还有颜色的RGB值

然后用OpenCV读取图片之后读取RGB值逐一显示出来：

 1 // OpenCV_default_color_channel.cpp : 定义控制台应用程序的入口点。
 2 //
 3
 4
 5 #include "opencv2/core/core.hpp"
 6 #include "opencv2/highgui/highgui.hpp"
 7 #include "opencv2/imgproc/imgproc.hpp"
 8 #include "opencv2/imgproc/imgproc_c.h"
 9 #include <iostream>
10 #include <string>
11
12 using namespace cv;
13 using namespace std;
14
15
16 int main(int argc, char* argv[])
17 {
18     Mat src;
19     src = imread("pic.jpg");
20
21     int channel1 = 0, channel2 = 0, channel3 = 0;
22     channel1 = ((uchar *)(src.data))[0];
23     channel2 = ((uchar *)(src.data))[1];
24     channel3 = ((uchar *)(src.data))[2];
25
26     cout << "channel1:" << channel1 << endl;
27     cout << "channel2:" << channel2 << endl;
28     cout << "channel3:" << channel3 << endl;
29
30     imshow("pic", src);
31
32     waitKey(0);
33     return 0;
34
35 }

结果如下，还真是BGR的坑爹顺序：