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);

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