openCV保存图像

//保存为png透明通道 vector<int>opts; opts.push_back(IMWRITE_PAM_FORMAT_RGB_ALPHA); imwrite("D:/img_bgra.png", img, opts); //保存为单通道灰度图像 img = cv::imread(imagePath.toStdString(), IMREAD_GRAYSCALE); vector<int> opts_gray; opts_gray.push_back(IMWRITE_PAM_FORMAT_GRAYSCALE); imwrite("D:/img_gray.png", img, opts_gray); //保存为默认的彩色BGR图像 imwrite("D:/img_BGR.png", img); //保存为png彩色压缩图像 img = imread(imagePath.toStdString(), IMREAD_ANYCOLOR); vector<int> opts_png_anycolor; opts_png_anycolor.push_back(IMWRITE_PAM_FORMAT_GRAYSCALE); opts_png_anycolor.push_back(9); imwrite("D:/img_png_anycolor.png", img, opts_png_anycolor); //保存为JPG高压缩比图像 img = imread(imagePath.toStdString(), IMREAD_COLOR); vector<int> opts_jpeg; opts_jpeg.push_back(IMWRITE_JPEG_QUALITY); opts_jpeg.push_back(50); opts_jpeg.push_back(IMWRITE_JPEG_OPTIMIZE);//启用 JPEG 优化 opts_jpeg.push_back(1); imwrite("D:/img_jpeg.jpg", img, opts_jpeg);