Edit file

File name : ppmquantall

Content :#!/bin/bash # # ppmquantall - run ppmquant on a bunch of files all at once, so they share # a common colormap # # WARNING: overwrites the source files with the results!!! # # Verbose explanation: Let's say you've got a dozen pixmaps that you want # to display on the screen all at the same time. Your screen can only # display 256 different colors, but the pixmaps have a total of a thousand # or so different colors. For a single pixmap you solve this problem with # ppmquant; this script solves it for multiple pixmaps. All it does is # concatenate them together into one big pixmap, run ppmquant on that, and # then split it up into little pixmaps again. usage() { echo "usage: $0 [-ext extension] <newcolours> <ppmfile> ..." exit 1 } ext= while :; do case "$1" in -ext*) if [ $# -lt 2 ]; then usage fi ext=".$2" shift shift ;; *) break ;; esac done if [ $# -lt 2 ]; then usage fi newcolors=$1 shift nfiles=$# files=($@) # Extract the width and height of each of the images. # Here, we make the assumption that the width and height are on the # second line, even though the PPM format doesn't require that. # To be robust, we need to use Pnmfile to get that information, or # Put this program in C and use ppm_readppminit(). declare -a widths declare -a heights for i in ${files[@]}; do widths=(${widths[*]} `egrep -v '^#' $i | sed '1d; s/ .*//; 2q'`) # #204890 heights=(${heights[*]} `egrep -v '^#' $i | sed '1d; s/ .*//; 2q'`) # #204890 done #all=`tempfile -p pqa.all -m 600` #all=.tmp.pqa.all.$$ #rm -f $all all=$(mktemp -t pqa.all.XXXXXXXXXX) || exit 1 #219019 pnmcat -topbottom -jleft -white ${files[@]} | ppmquant $newcolors > $all if [ $? != 0 ]; then exit $? fi y=0 i=0 while [ $i -lt $nfiles ]; do pnmcut -left 0 -top $y -width ${widths[$i]} -height ${heights[$i]} $all \ > ${files[$i]}$ext if [ $? != 0 ]; then exit $? fi y=$(($y + ${heights[$i]})) i=$(($i + 1)) done rm -f $all

Save