As the installation from source can be a hassle for native OS X users I advise you to use Homebrew. The use and installation of ImageMagick can intimidating, but this image manipulation package is the most powerfull I have encountered so far. ImageMagick is a command line interface program and made for this purpose. Answers without enough detail may be edited or deleted. Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. I uploaded a comparison of the different options to. Preview used to use the same resizing method as sips and Automator, but it has used a different one since 10.7. If others have less than 100,000 images, you might also use Preview: quality 100 creates files about twice as big -quality 95, which creates files about twice as big as -quality 88.įor f in *.jpg do sips -Z 500 -s format jpeg -s formatOptions 80 "$f" /tmp/ done The default filter for making images smaller is Triangle, which often makes images too blurry in my opinion. Compared to Lanczos ( Lanczos3), they are slightly less sharp, produce less ringing artifacts, and produce more Moiré patterns. Lanczos2 or the 2-lobe Lanczos is very similar to Catrom. path /tmp/ saves the output files to /tmp/ instead of modifying files in place. 500x would always change the width to 500 px and 500x500^ would make all images at least 500x500px. Then run a command like this: mogrify -filter lanczos2 -resize '500x500>' -format jpg -quality 90 -path /tmp/ *.jpgĥ00x500> makes images wider or taller than 500px fit to 500x500px. You can install ImageMagick with brew install imagemagick after installing Homebrew or with sudo port install imagemagick after installing MacPorts. sips and Automator (which use an identical resizing method) make images look too blurry without additional sharpening in my opinion. However, for the price (free), it's pretty dang convenient. Unfortunately, it doesn't seem to have an option to choose JPEG quality. Once you do that, Automator is going to churn and burn, and when it's done it'll beep at you. (The "show this action when the workflow runs" checkbox means that the workflow is going to pause, display the option, and allow you to change it then) All the images will be resized to either that size or by that percentage. You'll be able to choose either a fixed size or a percentage. ask you how big you want the resized copies to be.pop up another window asking where you want to save the resized copies. pop up a window asking you to pick some files (as many as you want).When you run this, Automator is going to: Next, add the following steps to the workflow by dragging and dropping: I'm a little surprised that no one has mentioned the easiest, cheapest, and least technical option: Automatorįirst, open Automator, which is in your Applications folder.
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