ImageMagick

Name: imagemagick
Rating: 76
Author: jholhewres

Use the bash tool with magick (v7) or convert (v6) for image processing.

Setup

bash

# Check if installed (magick = v7, convert = v6)
command -v magick || command -v convert

# Install — macOS
brew install imagemagick

# Install — Ubuntu/Debian
sudo apt install imagemagick

Info

bash

magick identify -verbose <image>
magick identify -format "%wx%h\n" <image>

Resize

bash

magick <input> -resize 800x600 <output>
magick <input> -resize 50% <output>
magick <input> -resize 800x600^ -gravity center -extent 800x600 <output>  # crop to fit

Convert Format

bash

magick input.png output.jpg
magick input.svg -density 300 output.png
magick input.webp output.png

Optimize

bash

magick input.jpg -quality 85 -strip output.jpg
magick input.png -strip -colors 256 output.png

Batch

bash

magick mogrify -resize 800x600 -quality 85 *.jpg

Compose

bash

magick base.png overlay.png -gravity southeast -composite output.png
magick -size 800x400 xc:white -font Helvetica -pointsize 48 -gravity center -annotate 0 "Text" output.png

Tips

•Use magick (v7) instead of convert (v6) when available
•Use -strip to remove metadata (reduces file size)
•Use mogrify for in-place batch operations