The following command will resize an image to a height of 100: convert example.png -resize x100 example.png Rotating an Image ImageMagick If you want to convert in-place use the mogrify command, otherwise use convert. The following command will resize an image to a width of 200: convert example.png -resize 200 example.png You can also specify a specific width or height and ImageMagick will resize the image to that width or height while preserving the aspect ratio. If you want to force the image to become a specific size - even if it messes up the aspect ratio - add an exclamation point to the dimensions: convert example.png -resize 200x100! example.png It will alter the image to fit within a 200×100 area, but the image may not be exactly 200×100. ImageMagick will try to preserve the aspect ratio if you use this command. We’ve used the same file name here, so ImageMagick will overwrite the original file. Go to Files & Folders > Ask for Finder Items, drag and drop the action to the right panel, choose items type as Folders. In the Choose a type for your document window, select Workflow and click Choose. The following command asks ImageMagick to resize an image to 200 pixels in width and 100 pixels in height: convert example.png -resize 200x100 example.png Steps to Batch Convert PNG to JPG with Mac Automator Step 1. The convert command can also quickly resize an image. Once installed, you will have multiple image processing tools available to our disposal, such as convert, identify and etc. #Terminal batch convert png to jpg installFirst you need to install imagemagick package: apt-get install imagemagick. ImageMagick uses the quality level of the input image, if possible. The best and the easiest way to resize multiple images using linux command line is to use imagemagick tools.
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