#!/usr/bin/perl
use warnings;
use strict;
use Image::Magick;

my $file = shift or die "Need a file $!\n";

my $img = Image::Magick->new;
$img->ReadImage($file);

# if you want a pixel by pixel list of every color
# a huge slow output
$img->Set(magick => 'txt');
$img->Write("$0.txt");

##################################################
#histogram
#returned values are an array of 
#red, green, blue, opacity, and count values.

my $tot = 0;
my (@colors) = $img->Histogram();

#print join "\n\n", @colors;

while (1){
     if (scalar @colors == 0){last}
     my $r = shift @colors;
     my $g = shift @colors;
     my $b = shift @colors;
     my $o = shift @colors;
     my $count = shift @colors; 
     $tot++;
print "$count ($r,$g,$b) at $o opacity\n"; 
}

print "\n$tot total colors\n";