![]() P.S.: ImageMagick’s convert.exe does support wildcards directly, but that usage was not easy for my use case, so I went with writing the batch file. The below screenshot shows the usage of the batch file and the output: The output of the batch file that converts all the images in a folder Remember, to change the path to the ImageMagick executables, to match the installation in your PC. Check the full list of the parameters supported by convert.exe to discover new capabilities including watermarking with a text or image, and, many more possibilities. The -strip parameter to convert.exe removes all the image meta-information (EXIF) that will help to protect your privacy. For the same reason, the script creates a folder by name “output” inside the current folder to store all the converted (output) files. To keep the batch file simple, the image size (Width and the Height) and the image quality (the JPEG compression percentage) are hard-coded. You call the above batch file and pass the parameter of the folder (as seen in the bottom of this post) that has all the images that you want to be converted, you may also specify the wildcards that are supported by DIR command. ![]() In the following batch file, I have hard-coded the image size (Width and the Height) and the image quality (the JPEG compression percentage), but you can easily make them configurable offįOR %%y IN (%1) DO Converting %%y to low\%%yĬ:\ProgramData\chocolatey\lib\imagemagick.tool\tools\convert.exe -auto-level -strip -resize 2000 -quality ? "%%y" "output\%%y" You can download and install from here, or use a package manager like ChocolateY for Windows (like I have done below) to install ImageMagick package. ![]() ImageMagick is open-source and free! An awesome tool chest that offers numerous image editing functions, and, it runs on Linux, Windows, Mac OS X, Android and iOS. Earlier, I was using Adobe Photoshop Elements’ “ Process Multiple Files” applet for this purpose. In this post, I am sharing a simple batch file to resize all the images in a folder using the powerful image manipulation library called ImageMagick. A few weeks back, I had shared a batch file to backup my WordPress blog running in Windows. Or, run the following command in your terminal.Having been a Windows GUI guy for nearly two decades, I am rediscovering the charm of command-line and Windows Batch files to automate repetitive tasks. I think you should accept that as the answer instead: /a/185897/5761. Almost all the tasks which can be performed using usual GUI tools can be done using ImageMagick’s convert command line tool.įor a complete list of all the things convert command can do, see the convert man page. Raymond (OP): I know you didnt ask for a command line version, but using imagemagick is more versatile and is objectively the more useful answer. In a similar way, other attributes can be modified. And of course, larger image size too as compared to high compression levels. └ Note: Lower compression level means better quality of image. To change the quality index (compression level) of a JPEG image, use: convert test.jpg -quality 15 test_2.jpg To change contrast level of an image, use : convert -brightness-contrast x5 test.png test_2.png To change image brightness, use: convert -brightness-contrast 10 test.png test_2.png convert test.png test.jpg Change Image Brightness and ContrastĬonvert can be used to modify attributes such as brightness, contrast, compression level, etc. It supports huge number of formats.īelow is an example command to convert a PNG image to JPG format. The convert tool can convert images from one image format to the other. # This keeps the width but changes height to 200 Convert Image Format # This keeps the height but changes width to 300 ![]() # 300 is the width to be converted to in pixels, and 200 is the height in pixels # Here test.png is the source image, test_2.png is the name for converted image To resize an image, we use the flag -resize: convert test.png -resize 300x200 test_2.png ![]() To install on CentOS and Fedora, run: yum install ImageMagick Resize an Image using Convert └ Note: For older Ubuntu versions (version 14.04 and below), you need to use apt-get instead of apt. If it is not installed, we can install it on Ubuntu and Debian with: sudo apt install imagemagick Installing ImageMagick ( convert)įirst verify if ImageMagick is already installed using: convert -version Use Image Converter to create, edit, compose, or convert bitmap images. It consists of many tools with number of options for image modification, conversion, etc. ImageMagick is a suite of image modification software for Linux. ![]()
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