Malin Freeborn
ba8026e0c3
input examples are now given as ```bash input $ARG1 ``` While outputs use md's '> ' sign as a quote.
117 lines
2.0 KiB
Markdown
117 lines
2.0 KiB
Markdown
---
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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)
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Convert jpg to png.
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```bash
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convert image.jpg image.png
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```
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```bash
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convert image.jpg -quality 50 image.jpg
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```
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'Quality' must be from 1 to 100.
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```bash
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convert -resize 50% image.jpg image2.jpg
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```
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Resizing only changes jpegs. Change a png with:
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```bash
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convert input.png png8:out.png
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```
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# Invert Colours
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```bash
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convert input.jpg output.jpg -negate
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```
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# Make Images Smaller
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```bash
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convert image.jpg -resize 25% output.jpg
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```
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# Trim images to border
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This is generally used for transparrent images.
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```bash
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convert -trim image.png output.png
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```
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Make the white of an image transparrent.
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```bash
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convert -transparent white -fuzz 10% input.png output.png
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```
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The 'fuzz' option tells the computer that 'close to white' is fine. You might want to use 20% or higher fuzz.
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## Dropshadow
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```bash
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`convert <input file> \( +clone -background black -shadow 50x8+0+5 \) +swap -background none -layers merge +repage <output file>`
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```
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# Convert every jpg in directory to png
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```bash
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mogrify -format png *.jpg
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```
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# Printing Words
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# 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
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do convert "$i" $(ls "$i" | sed s#jpg\$#svg#)
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done
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```
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# SVG
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The above script has crappy results.
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It's better to use potrace.
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```
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$convert -flatten input.jpg output.ppm
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$potrace -s output.ppm -o svgout.svg
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```
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# Writing Words
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[docs](https://www.imagemagick.org/Usage/text/)
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See your installed fonts:
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```bash
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convert -list font
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```
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Make na image showing day of the week:
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```bash
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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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```
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Make a meme:
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```bash
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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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```
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