for($y=1;$y <= $height;$y++){
    for($x=1;$x <= $width;$x++){

##</code><code>##

for my $y ( 0 ..  $height - 1 ){
    for my $x ( 0 .. $width - 1 ){

##</code><code>##

for my $y ( 1 .. 3 ) { 
    for my $x ( 1 .. 3 ) { 
        print "[$x:$y] => ", $x*$y-1; 
    } 
}
[1:1] =>  0
[2:1] =>  1
[3:1] =>  2
[1:2] =>  1
[2:2] =>  3
[3:2] =>  5
[1:3] =>  2
[2:3] =>  5
[3:3] =>  8

##</code><code>##

        my $pixel = ( $y * $width ) + $x;

##</code><code>##

        if( $data[ $pixel ] == 0 ){
            $image->setPixel( $x, $y, $dbz1 );
        }
        if( $data[ $pixel ] > 0 and $data[$pixel] <= 10){
            $image->setPixel($x,$y,$dbz5);
        }
        if ($data[$pixel] > 10 and $data[$pixel] <= 20){
            $image->setPixel($x,$y,$dbz10);
        }
        if ($data[$pixel] > 20 and $data[$pixel] <= 30){
            $image->setPixel($x,$y,$dbz15);
        }

##</code><code>##

        if( $data[ $pixel ] == 0 ){
            $image->setPixel( $x, $y, $dbz1 );
        }
        elsif( $data[ $pixel ] <= 10 ){
            $image->setPixel( $x, $y, $dbz5 );
        }
        elsif( $data[ $pixel ] <= 20 ){
            $image->setPixel( $x, $y, $dbz10 );
        }
        elsif( $data[ $pixel ] <= 30 ){
            $image->setPixel( $x, $y, $dbz15 );
        }
        else {
            ## What do you want to do if the value is greater than 30??
        }

##</code><code>##

open JPEG,'>','test_image.jpg' || die;
print JPEG $image->jpeg();

##</code><code>##

binmode JPEG;

##</code><code>##

#!/usr/bin/perl -w
use strict;
use GD;
use File::Slurp;

my $width = 102;
my $height = 123;

my $image = GD::Image->new( $width, $height, 1 );

my $dbz1 = $image->colorAllocate(0,0,0); #-30
my $dbz2 = $image->colorAllocate(204,255,255); #-28
my $dbz3 = $image->colorAllocate(204,153,204); #-25
my $dbz4 = $image->colorAllocate(153,102,153); #-20
my $dbz5 = $image->colorAllocate(102,51,102); #-15
my $dbz6 = $image->colorAllocate(204,204,153); #-10
my $dbz7 = $image->colorAllocate(153,153,102); #-5
my $dbz8 = $image->colorAllocate(102,102,51); #0
my $dbz9 = $image->colorAllocate(102,255,255); #5
my $dbz10 = $image->colorAllocate(51,153,255); #10
my $dbz11 = $image->colorAllocate(0,0,255); #15
my $dbz12 = $image->colorAllocate(0,255,0); #20
my $dbz13 = $image->colorAllocate(0,204,0); #25
my $dbz14 = $image->colorAllocate(0,153,0); #30
my $dbz15 = $image->colorAllocate(255,255,0); #35
my $dbz16 = $image->colorAllocate(255,204,0); #40
my $dbz17 = $image->colorAllocate(255,104,0); #45
my $dbz18 = $image->colorAllocate(255,0,0); #50
my $dbz19 = $image->colorAllocate(204,51,0); #55
my $dbz20 = $image->colorAllocate(153,0,0); #60
my $dbz21 = $image->colorAllocate(255,0,255); #65
my $dbz22 = $image->colorAllocate(153,51,204); #70
my $dbz23 = $image->colorAllocate(255,255,255); #75
my $dbz24 = $image->colorAllocate(255,255,255); #80

print "$dbz1\n";
my @data = read_file('test_image.txt');
print "@data\n";

for my $y ( 0 ..  $height - 1 ){
    for my $x ( 0 .. $width - 1 ){
        my $pixel = ( $y * $width ) + $x;
#        print "Pixel Value: $data[$pixel]\n";
        if( $data[ $pixel ] == 0 ){
            $image->setPixel( $x, $y, $dbz1 );
        }
        elsif( $data[ $pixel ] <= 10 ){
            $image->setPixel( $x, $y, $dbz5 );
        }
        elsif( $data[ $pixel ] <= 20 ){
            $image->setPixel( $x, $y, $dbz10 );
        }
        elsif( $data[ $pixel ] <= 30 ){
            $image->setPixel( $x, $y, $dbz15 );
        }
        else {
            ## What do you want to do if the value is greater than 30??
        }
    }
}

open JPEG,'>','test_image.jpg' or die $!;
binmode( JPEG );
print JPEG $image->jpeg();
close JPEG;
exit;