lk/vision/imagemagick.md

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---
title: "imagemagick"
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tags: [ "Documentation", "Vision" ]
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---
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[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
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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
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This script converts all jpg files in a directory to svg.
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```
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for i in *jpg
do convert "$i" $(ls "$i" | sed s#jpg\$#svg#)
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done
```
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# SVG
The above script has crappy results.
It's better to use potrace.
```
$convert input.jpg output.ppm
$potrace -s output.ppm -o svgout.svg
```
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# Writing Words
[docs](https://www.imagemagick.org/Usage/text/)
See your installed fonts:
> convert -list font
Make na image showing day of the week:
> convert -fill blue -font Sauce-Code-Pro-Semibold-Nerd-Font-Complete-Mono -gravity center -pointsize 79 label:$(date +%A) day.png
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Make a meme:
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> convert inputmemeimage.png -font impact -fill white -pointsize 84 -stroke black -strokewidth 3 -gravity north -annotate +0+20 'TOP MEME TEXT' -gravity south -annotate +0+20 'BOTTOM MEME TEXT' outputmemeimage.png
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