We can process all picture using Oropo Executor system. Tasks for processing pictures will be added to a queue and processed parallelly on many computers. Each picture will be processed with script make_smaller.sh.

#!/bin/bash

MAKE_SMALLER=$PWD/make_smaller.sh
IMGS_DIR=$PWD/imgs

for file in $IMGS_DIR/*; do
	oropo-system-pusher -p "string:bash" -p "path:$MAKE_SMALLER" -p "path:$file"
done

Processing results can be found in /var/lib/oropo/response/*/0 files.