Resize images through unix terminal

This is a small script I use to resize and shrink size of images through unix terminal.

setopt nullglob; for file in *.{JPG,jpg,jpeg}; do convert $file -strip -resize 2660x\> -quality 80 "`basename $file .jpg`-resized.jpg"; done

The script will resize all jpg images in the folder to a max-width of 2660px and a quality of 80 and also remove all metadata from the image. Simple to modify to your needs. This will also keep the original images.

The setopt nullglob is for zsh to prevent the script from stop if on the first error it encounters.

If you want to override the original images you can use the following script.

setopt nullglob; for file in *.{JPG,jpg,jpeg}; do convert $file -strip -resize 2660x\> -quality 80 "$file"; done

Another way to write this is to use find instead of a for loop. In this example your do not need to use setopt nullglob and it will also work in bash.

find . -type f \( -iname "*.jpg" -o -iname "*.jpeg" \) | while read file; do
    echo "Converting $file"
    convert "$file" -strip -resize 2660x\> -quality 80 "$file"
done

For this to work you need to have imagemagick installed on your system. imagemagick on Homebrew

brew install imagemagick