Álvaro Ramírez
Use ImageMagick to batch-resize images
Using percentage:
$ mogrify -resize 10% *.png
Using dimensions:
$ mogrify -resize 120x120 *.png
Lots of other alternatives from ImageMagick's documentation:
| -resize | scale% |
| -resize | scale-x%xscale-y% |
| -resize | width |
| -resize | xheight |
| -resize | widthxheight |
| -resize | widthxheight^ |
| -resize | widthxheight! |
| -resize | widthxheight> |
| -resize | widthxheight< |
| -resize | area@ |
Fix image aspect ratios for Instagram:
$ mogrify -resize 1080x1350 -gravity center -extent 1080 *.jpg