Quoted By:
fini
I found a better way to meet the minimum requirements for posting tiles. For this thread I foolishly used this command:
-convert -bordercolor white -border 600 input.jpg output.jpg
However we can add whitespace to expand the image to a specified size (600x480):
-convert input.jpg background white -gravity center -extent 600x480 output.jpg
The result is like pic related