#! /bin/tcsh -f
# Last edited on 2002-08-23 17:43:46 by hcgl

set cmd = "$0"; set cmd = "${cmd:t}"
set usage = "${cmd} IMG"

# Blurs each image so that we can pick the background field 
# more reliably.

if ( $#argv != 1 ) then
  echo "usage: ${usage}"; exit 1
endif

set img = "$1"; shift;

set tmp = /tmp/$$

echo "averaging ${img}{a,b,c}-L.png -> ${img}{a,b,c}-LS.png"

foreach light ( a b c )
  convert ${img}${light}-L.png ppm:- \
    | pnmsmooth -size 7 7 \
    | convert ppm:- ${img}${light}-LS.png
end