[Source](http://lxlinux.com/imagemagick.html)

Convert jpg to png.

> convert image.jpg image.png

> convert image.jpg -quality 50 image.jpg

'Quality' must be from 1 to 100.

> convert -resize 50% image.jpg image2.jpg

Resizing only changes jpegs.  Change a png with:

> convert input.png png8:out.png

# Invert Colours

> convert input.jpg output.jpg -negate

# Make Images Smaller

> convert image.jpg -resize 25% output.jpg


# Trim images to border
This is generally used for transparrent images.

> convert -trim image.png output.png

Make the white of an image transparrent.

> convert -transparent white -fuzz 10% input.png output.png

The 'fuzz' option tells the computer that 'close to white' is fine.  You might want to use 20% or higher fuzz.


## Dropshadow

> `convert <input file> \( +clone -background black -shadow 50x8+0+5 \) +swap -background none -layers merge +repage <output file>`


# Convert every jpg in directory to png

> mogrify -format png *.jpg

# Printing Words

# Mass convert

This script converts all jpg and png files in a directory to svg.

```
for i in *png *jpg
do for j in *$i
do convert $j -resize 2048 $(ls $j | sed s#.$i\$#.svg#)
done
done
```

# Writing Words

[docs](https://www.imagemagick.org/Usage/text/)

See your installed fonts:

> convert -list font

Make na image showing day of the week:

> convert -fill blue -font Sauce-Code-Pro-Semibold-Nerd-Font-Complete-Mono -gravity center -pointsize 79 label:$(date +%A) day.png