Here's another take on the same idea.
I often find myself wanting to output
temporary color spacer gif's for html design
and layout purposes.
Adjust the width, height and color of
a gif file and output without an image module (ie ImageMagick, GD).

#!/usr/bin/perl -w
# this script outputs a gif 
# set color, width, and height
use strict;

&printGIF("0000FF","33","10");
######################################
sub printGIF{
my $color = $_[0];
my $WH = sprintf("%lX",$_[1]);
my $HH = sprintf("%lX",$_[2]);
$color =~ s/(..)(..)(..)/$1\|$2\|$3/;
my($RH,$GH,$BH)=split(/\|/,$color);
print STDOUT "Content-type:image/gif\n\n";
my @gif=(
"47", "49", "46", "38", "37", "61", "$WH", "00", 
"$HH", "00", "A1", "01", "00", "$RH", "$GH", "$BH",
"FF", "FF", "FF", "00", "00", "00", "00", "00", 
"00", "21", "F9", "04", "05", "00", "00", "01", 
"00", "2C", "00", "00", "00", "00", "$WH", "00", 
"$HH", "00", "40", "02", "$HH", "84", "8F", "A9", 
"CB", "ED", "0F", "A3", "9C", "B4", "DA", "8B", 
"B3", "DE", "9C", "17", "00", "3B"
);
binmode (STDOUT); # if needed
foreach my $bit(@gif){
my $bita = hex($bit);
$bita = pack("C",$bita);
print STDOUT $bita;
}
}#################################### end printGIF
[download]

jtrue