#! /bin/csh -fe
# Last edited on 2008-10-11 11:28:49 by stolfi

# Converts a linear-scale ppm file to a gamma-corrected, normalized,
# grayscale GIF file, using the gray subset of the standard 6x6x6 colormap.

# Set program paths:

set maplib = "${STOLFIHOME}/PUB/colormaps"
set jslib  = "${STOLFIHOME}/lib"
foreach d ( "${STOLFIHOME}/pkg/netpbm-1mar1994-1/PUB/${PLATFORM}/bin" "/usr/bin" )
  if ( -x $d/ppmtogif ) set pbmbin = "$d"
end
set jsbin  = "${STOLFIHOME}/bin/${PLATFORM}"

# Option parsing:

set scriptname = "$0"
set usagetail = "[ < ] INFILE.ppm > OUTFILE.gif "
unset transparent
source ${jslib}/linear-ppm-to-gif-options.csh

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

( ${getimg} $* ; yes ) \
  | ${pbmbin}/ppmtopgm \
  | ${pbmbin}/pgmnorm -bpercent 2 -wpercent 5 \
  | ${jsbin}/ppmvquant \
      -fs \
      -map ${maplib}/standard-6-graymap-${gammatag}.ppm \
  | ${pbmbin}/pnmgamma ${gamma} \
  | ${pbmbin}/ppmtogif ${giftropts}