1 #include<iostream>
 2 #include<opencv.hpp>
 3
 4 using namespace std;
 5 using namespace cv;
 6
 7 int main()
 8 {
 9
10     Mat sou;
11     sou = imread("C:\\Users\\32829\\Desktop\\aa.jpg");
12     if (!sou.data)
13     {
14         cout << "图像载入失败" << endl;
15     }
16     namedWindow("old");
17     imshow("old", sou);
18
19     Mat dst;
20     //定义一张空的图片
21     dst = Mat::zeros(sou.size(), sou.type());
22     int height = sou.rows;//图片的高度
23     int weight = sou.cols;//图片的宽度
24     float alpha = 1.2;//自己设置的亮度的那个a
25     float beta = 30;//增量
26     for (int row = 0; row <( height); row++)
27     {
28         for ( int col = 0; col <( weight); col++)
29         {
30             //一通道直接就是修改就行了
31             if (sou.channels() == 1)
32             {
33                 int v = sou.at<uchar>(row, col);
34                 dst.at<uchar>(row, col) = saturate_cast<uchar>(v*alpha + beta);
35
36             }
37             if (sou.channels() == 3)
38             {
39                 //三通道，先获得他的每个通道的数值，然后再修改，赋给新的图片
40                 float b = (sou.at<Vec3b>(row, col)[0]);
41                 float g = (sou.at<Vec3b>(row, col)[1]);
42                 float r = (sou.at<Vec3b>(row, col)[2]);
43                 dst.at<Vec3b>(row, col)[0] = saturate_cast<uchar>(b * alpha + beta);
44                 dst.at<Vec3b>(row, col)[1] = saturate_cast<uchar> (g * alpha + beta);
45                 dst.at<Vec3b>(row, col)[2] = saturate_cast<uchar> (r * alpha + beta);
46             }
47         }
48     }
49
50     namedWindow("new1");
51     imshow("new1", dst);
52
53
54
55
56
57
58
59
60
61
62     waitKey(0);
63
64
65
66
67     return 1;
68 }