John Brier » linux bash http://cupcakecarnival.net the small home of John Brier Tue, 24 Aug 2010 14:32:01 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 How to resize images in batch using ImageMagick and bash http://cupcakecarnival.net/index.php/2009/11/20/how-to-resize-images-in-batch-using-imagemagick-and-bash/ http://cupcakecarnival.net/index.php/2009/11/20/how-to-resize-images-in-batch-using-imagemagick-and-bash/#comments Fri, 20 Nov 2009 05:33:00 +0000 John http://cupcakecarnival.net/?p=162 I have taken a lot of pictures while I have been in Australia. In order to save time and bandwidth when I upload them to my site I have been resizing them to 800×600 from their normal 2536×1536 resolution. This reduces size per image from 1.4 MB to ~200 KB.

To do this if your images are in ~/Pictures and you want to put the resized images in ~/Pictures/resized you can use a simple for loop like the following with the ‘convert’ command from the ImageMagick suite

Assuming you are already in ~/Pictures/ run the following:

for i in `ls *.jpg | xargs`; do convert $i -resize 800×600 ~/Pictures/resized/$i-resized.jpg; done;

If your original file was named original.jpg it will now be named original.jpg-resized.jpg

There is probably a way to make that output file name cleaner but I haven’t looked into it yet.

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