保存图像
            
            
              cpp
              
              
            
          
          	//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);推荐一个零声学院项目课,个人觉得老师讲得不错,分享给大家:
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