Image manipulation
Small CLI recipes for image transformation.
Center a image with padding
You want to change the dimensions of an image, filling the new spots with white space.
convert -size 512x512 xc:white in.png -gravity center -composite out.png
Resize with -extent
plus -background
will also work.
Resize image
convert in.png -resize 32x32 out.png
More at Resizing Images with ImageMagick.
Remove extra white space around image
convert in.png -trim out.png