#!/usr/bin/perl 

use strict;
use warnings;

use Image::Magick;

my $image = Image::Magick -> new;
$image -> Set(size => '10x10');
$image -> ReadImage ('canvas:red');

my ($width, $height) = $image->Get('width', 'height');

my %myRGB;
$myRGB{'0,0'} = [ 1, .5, 0 ];
$myRGB{'5,5'} = [ 0, 1, 0 ];
$myRGB{'3,2'} = [ 1, 1, .2 ];
$myRGB{'4,8'} = [ 0, 0, 1 ];

for my $x (0..$width-1) {
  for my $y (0..$height-1) {
    if (exists $myRGB{"$x,$y"}) {
      $image -> SetPixel (x=>$x, y=>$y, color => $myRGB{"$x,$y"} ) 
    }
  }
}
$image -> Write ('test.png');