PowerShell calls .NET image classes, batch-lossless conversion of picture formats, supports PNG→JPG, etc. conversion, requires administrator privileges, sets the implementation strategy, runs the script after entering the target directory;批处理调用mspaint.exe /pt也可以静默转换； macOS用户可以使用预装的sips命令来实现格式转换。 API，真正重编码，不修改，支持PNG→JPG、BMP→PNG、GIF→JPG等常见转换，无图形界面，转换后图像质量可控。 CurrentUser

第一步：进入图片所在文件夹。例如，图片全在D:\Photos，则输入：cd "D:\Photos"

第四步：运行转换脚本。 The following commands will convert the current directory of all PNG files to JPG, the default quality is 90%: $files = Get-ChildItem *.pngforeach ($file in $files) { $img = [System.Drawing.Image]::FromFile($file.FullName) $newPath = [System.IO.Path]::ChangeExtension($file.FullName, ".jpg")  $img.Save($newPath, [System.Drawing.Imaging.ImageFormat]::Jpeg)  $img.Dispose()}

【Note：Do not close the PowerShell window during script execution，Intermittent closing will cause part of the picture to be unsaved】批设计+画图静默乙存（免PowerShell）

Applicable to disable PowerShell strategy 或对.NET unfamiliar operator.使用mspaint.exe /pt参数触发打印导出路径，本质是在后台调用打印机驱动系统生成JPG，无需交互。 下载方法电影服务，设置贻事内容（以PNG达JPG的于例）：@echo offfor %%i in (*.png) do (  start /wait mspaint.exe "%%i" /pt "%%~dpi%%~ni.jpg")pause

2. 3.右键单击.bat文件→“属性”→律集“技足动力”→单击“确定”。 Put all the converted PNG files into the same folder, then drag the folder to the ConvertPNGtoJPG.bat icon and release it——automatically open→静默 export→close the drawing window.

Methods 二：Execute directly in the resource manager address bar（单次电视）

Enter the picture folder, enter cmd回车 in the address bar → pop up command prompt → input: for %i in (*.webp) do mspaint.exe "%i" /pt "%~dpi%~ni.jpg"

This command will immediately start the drawing and try to export it, but it is necessary to confirm in advance that the WebP image已安装扩展程序，否则绘图将无法打开 WebP 文件。在Mac上使用sips命令批量转换。 macOS users do not need to install any tools, sips is a pre-installed command line image processing system, it supports HEIC, PNG, JPG, TIFF, etc., and other formats can be converted, EXIF and original size can be preserved, and the output path can be customized.打开终端，cd进入图片文件夹，例如：cd ~/Desktop/MyImages

2.执行命令转换（将所件PNG达的JPG）： sips -s format jpeg *.png --out ./output_jpg/

3.目标文件夹output_jpg不存在，需要创建：mkdir -p ./output_jpg

4. 如问通用JPG quality, add parameters: sips -s format jpeg -s formatOptions 95 *.png --out ./output_jpg/

This step must be specified--out path, otherwise sips will cover the original document——【不加--out是是电影去原原图，不逆】