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Accepted
Parto
Asked: 2015-03-11 01:01:31 +0800 CST

Is there a way to fill an image with its background color to square size?

  • 772

Let me describe my problem:

I have a site where I post sponsors company logos. Once I'm sent the logo (or I've googled) they are usually in rectangle size - width and height are not equal.
On my site, once you upload the logo image, you then crop it to a square.

For logos that are rectangular, I usually open them up in GIMP, increase the canvas size to a square, create a new layer of the background color and finally export it as jpg or png for the site. Quite time consuming.

I'm looking for a way to do that hopefully with just a terminal command.

EXAMPLE:

Consider this Safaricom (Kenyan Telecommunication company) logo below. It's of 650px by 380px - how can I make it 650px by 650px and then center it horizontally from the command line?

safaricom logo

command-line

1 Answers

  1. Best Answer

    You can use the following command which requires imagemagick (sudo apt-get install imagemagick):

    pic="ty338.png"; convert $pic -trim $pic ; width=$(identify -format "%w" $pic); height=$(identify -format "%h" $pic); new_dim=$((width > height ? width+10 : height+10)); convert $pic -gravity center -extent "${new_dim}x${new_dim}" $pic
    • The first convert command trims your picture to remove borders
    • Then I use identify to find the max dimension (width or height)
    • I add a 10px border (feel free to change or remove it)
    • Finally the last convert command use -gravity to center the logo in a square canvas.

    You can even paste this command into a bash function in your $HOME/.bashrc:

    squarize()
{
    pic=$1
    convert $pic -trim $pic
    width=$(identify -format "%w" $pic)
    height=$(identify -format "%h" $pic)
    new_dim=$((width > height ? width+10 : height+10))
    convert $pic -gravity center -extent "${new_dim}x${new_dim}" $pic
}
    • 7