Resizing the image with padding using convert on ubuntu
You need to use -extent to set the size of the canvas directly after you have resized, and the newly created area will be filled with whatever you set the -background to.
So, if you want the padding to be magenta, do this:
convert image.png -resize 100x100 -background "rgb(255,0,255)" -extent 100x100 out.pngIf you want your image to appear "in the middle" of the output image, with the padding evenly spaced around the sides, add in -gravity center like this:
convert image.png -resize 100x100 -gravity center -background "rgb(255,0,255)" -extent 100x100 out.pngSo, if we start with a wide blue image, that is 300x100 and has no chance of fitting properly in a square, as follows:
and we resize it with this:
convert image.png -resize 100x100 -gravity center -background "rgb(255,0,255)" -extent 100x100 out.pngwe will get this
