#!/bin/bash
# Use a simple shell loop, to process each of the images.
mkdir thumbnails
#  for $a in *.png
#  echo $a
#  do convert -thumbnail $a 32x32 thumbnails/$f.png
#done

# Use find to substitute filenames into a 'convert' command
  # This also provides the ability to recurse though directories by removing
  # the -prune option, as well as doing other file checks (like image type,
  # or the disk space used by an image).
  find * -prune -name '*.png' \
         -exec  convert '{}' -alpha set -channel RGBA -fill none -opaque white \
         -thumbnail x32 thumbnails/'{}' \;
# -alpha set -channel RGBA -fill none -opaque white test.png
#for i in `find . -name "*.png`
#echo $i
#do
#  convert $i -thumbnail 32x32 `basename $i.png`.png
#done