Generate multiple image sizes from a directory tree.

resize.sh

#!/bin/bash

if [ $# -ne 2 ]
then
  echo usage: $(basename $0) source_path dest_path
  exit
fi

path=$2/$(dirname $1)
mkdir -p $path

for z in 128 256 512
do
  sips -Z $z --out $path/$(basename $1 .png)_$z.png $1
done

Use the OS X command-line utility sips to generate different-sized images from a directory tree of .png files. The new file names have sizes appended and saved to the dest_path with similar directory structure. This needs to run from the base directory of your source tree.

find . -name \*.png -exec ../resize.sh {} ../resized \;

If you have recent aws installed (brew install awscli, then aws configure) you can update S3 like so:

aws s3 sync . s3://assets.nbabreakaway.com/cards --acl public-read --cache-control max-age=3600