1.4 KiB
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
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