- imagemagick package installed
Generally, the command for a single file is:
convert [input_image.jpg] -resize [percentage]% [output_image.jpg]
Now, to batch-resize a folder with images we can write a small shell script that converts each image in the folder.
We want the resized images in a subfolder called “resized”.
#!/bin/bash if [ ! -d resized ]; then mkdir resized fi for f in `find . -name "*.JPG"` do convert $f -resize 50% resized/$f done
In the example above, we find all files with “.JPG” extension and pass them to the convert command.
Also, see the “-resize 50%” part. You might want to adjust 50 to your needs.
Drop that script into the folder, e.g. ~/images/convert_script.sh and:
cd ~/images/ chmod u+x convert_script.sh ./convert_script.sh