How to batch resize images in Ubuntu recursively within the terminal?

Question

I have multiple images stored in a set of organized folders. I need to re-size those images to a specific percentage recursively from their parent directory

Answer 1

You can use imagemagick tool for batch resize.

It will maintain the aspect ratio

$ convert dragon.gif    -resize 64x64  resize_dragon.gif

It will not maintain the aspect ratio

$ convert dragon.gif    -resize 64x64\!  exact_dragon.gif

$ cat resize.sh 
#!/bin/bash
for f in `find . -name "*.jpg"`
do
    convert $f -resize 45x60\!  $f.resize.jpg
done

It will resize the image to 45x60 without maintaining the aspect ratio in current directory.