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vision/ffmpeg.md

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+sound/ffmpeg.md

vision/imagemagick.md

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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
+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
+
+
+
+

vision/qrencode.md

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+
+Make a QR Coded message:
+
+qrencode -t ansi "Hello World"
+