![]() Please feel free to comment below if you have any queries/concerns. If you found this article helpful, please do share with your friends and spread the knowledge. In this article, we showed you several examples to Resize, Convert and Modify Images from the Linux command-line $ for image in *.jpg do convert "$image" "batch-process/$.jpg" done Wrapping Up In this example, we are going to convert all images in a folder from JPEG format to PNG format. Create a small bash script to achieve this. ImageMagick allows you to process multiple files at once. Run the following command to apply the “monochrome” effect to an image: $ convert sample.jpg - monochrome sample-monochrome.png Batch conversion Run the following command to apply the “charcoal” effect to an image: $ convert sample.jpg - charcoal 1 sample-charcoal.jpg You can apply a variety of effects to an image using ImageMagick. The above command adds a one pixel wide red border to the output image. $ convert - border 1x1 -bordercolor "#FF0000" sample.jpg sample-3.jpg I have added a red color border, but you can change the color code as per your need. Sometimes you may need to add a border to an image. In this example, we will resize the image to half the size of the original (50%): $ convert sample.jpg -resize 50% sample-2.jpg You can verify the change in size by running the following command: $ identify sample-2.jpg This will change the image to fit within the 800×600 area, but the image will not be exactly 800×600. Make a Note: If you use this command, ImageMagick will try to preserve the aspect ratio. In this example, I will reduce the size of my image from 3138×2012 pixels to 800×600 pixels. Now, run the following command to resize the image. The following command can print the dimensions of a given image file: $ identify sample.jpg To do so, you need to know the dimensions of your original image. This can be done by specifying the new width and height of the image in pixels. The ‘convert’ command can quickly resize the given image. This Conversion has reduced the size of the image, but not the image pixels. See below: $ convert sample.jpg - quality 55 sample-1.jpg ![]() If the image size is too large and you want to reduce its size (in MBs or KBs) then specify a compression level while converting them. The below command converts the image “sample.jpg” from JPEG format to PNG: $ convert sample.jpg sample.png ![]() It converts images from one image format to another. The ‘convert’ command is one of the most used command. Version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 Ĭopyright: © 1999-2019 ImageMagick Studio LLCĭelegates (built-in): bzlib djvu fftw fontconfig freetype jbig jng jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib Convert Between Image Formats Run the following commands to find out the installed version of ImageMagick: $ identify -version It supports batch processing, which allow you to process several images at once.įor openSUSE systems, use the zypper command to install ImageMagick: $ sudo zypper install -y ImageMagick It can resize, mirror, rotate, transform images, adjust image colors, apply various special effects, etc. It can read and write images in a variety of formats (over 200) including PNG, JPEG, GIF, PDF, SVG, etc. It is used to create, edit, compose, or convert bitmap images. ImageMagick is a free and open source, feature-rich, command-line based image manipulation tool. In this guide, we will show you how to use ImageMagick tool to easily Resize, Convert and Modify Images from the Linux command-line. There are many tools for this purpose, and we are going to discuss about ImageMagick tool. Mostly I use the compression option to reduce the actual size of the image to load them quickly on the web. I take lots of screenshots as part of the article preparation and edit them before adding them to my blog article. I often work with images while preparing technical articles for 2DayGeek (this website).
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