OpenCV实现更改图片颜色功能
原图效果:
更改颜色后效果:
直接上源码:
#include <opencv2/opencv.hpp> #include <iostream> #include <vector> #include <cstdio> #include <cstring> using namespace cv; using namespace std; int main(int argc, char const* argv[]) { Mat srcImg = imread("E:/img/kai.png", IMREAD_UNCHANGED); //-1不做任何改变 Mat srcImg1 = imread("E:/img/kai.png", 0); //0灰度 Mat srcImg2 = imread("E:/img/kai.png", 1); //1是color cout << srcImg.channels() << endl; cout << srcImg1.channels() << endl; cout << srcImg2.channels() << endl; imshow("-1", srcImg); imshow("0", srcImg1); imshow("1", srcImg2); //颜色有空间 RGB (1) RGBA(-1) 透明度 灰色空间(0) //1、存储阶段的颜色值 vector<Vec3d> colors; unsigned long index = 0; for (int i = 0; i < 6; ++i) { for (int j = 0; j < 6; ++j) { for (int k = 0; k < 6; ++k) { colors.push_back(Vec3d()); colors[index][0] = i / 5.0 * 255; colors[index][1] = j / 5.0 * 255; colors[index][2] = k / 5.0 * 255; index++; } } } //2、更对对应的颜色值 index = 0; Mat temp = srcImg.clone(); while (index < colors.size()) { for (int r = 0; r < srcImg.rows; ++r) { for (int c = 0; c < srcImg.cols; ++c) { //获取像素点的颜色 //c4b &pixel = srcImg.at<Vec4b>(r, c); //4b和4d有区别的,b是uchar, d是double Vec4b &pixel_temp = temp.at<Vec4b>(r, c); //如果当前点的透明度为0 if (pixel_temp[3] == 0) { continue; } else { for (int i = 0; i < 3; ++i) { pixel_temp[i] = colors[index][i]; } } } } //3、保存需要的图片 char outImagePath[64] = {}; sprintf_s(outImagePath, "E:/img/outImagePath/out_img_%.0f_%.0f_%.0f.png", colors[index][0], colors[index][1], colors[index][2]); imwrite(outImagePath, temp); index++; } //waitKey(0); return 0; }
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