imagemagick script: image background is a larger, blurred copy of itself.

index.sh

for f in *.jpg; do
  convert ./"$f" -gravity center -resize 1137 -extent 1137x640 -blur 0x4 ./finalcat/"new-$f"
  convert ./finalcat/"new-$f" -page +248 ./"$f" -flatten ./finalcat/"new-$f"
done

Like so 👆

test photo source

We use this script for creating images for a Chromecast screen saver that pulls from a Google+ album. 📺

Script assumes a folder full of Instagram images at 640x640 and a final output size of 1137x640 (which works with the ratio of our TV).