Thank you, this is wonderful!

I'm using it as:

sub palette_rgb_gd {
   my $abs_path = _abs_path($_[0]) or return;
   
   my @colors;


   require GD;
   my $img = GD::Image->new( $abs_path ) or die $!;

   my $colors = $img->colorsTotal
       or carp("$abs_path is a truecolor image (no palette)?");

   for ( 0 .. $colors ) {
      my $rgb = sprintf '%02x%02x%02x', $img->rgb( $_ );
      #debug( $rgb);
      #printf "%5d: R:%2x G:%2x B:%2x\n", $_, $img->rgb( $_ );
      push @colors , $rgb;
   }      
   return @colors;
}
[download]

This is way better than what I was doing before!

sub identify_im {
   my $abs_path = _abs_path($_[0]) or return;

   my %HASH;

   my $cmd = "identify -verbose '$abs_path'";
   

   my @_i = split(/\n/, `$cmd`);  
   if( $? ){ carp("problem with : $cmd, $abs_path, $?") and return; }
   
   @_i and scalar @_i or carp("no output with : $cmd, $abs_path") and 
+return;

   my $lastkey;   
   for my $_line (@_i){
      $_line=~s/^\s+|\s+$//g;

      $_line=~s/([^\:]+)\://;

      my($k,$v) = ($1,$_line);

      if ($k=~/^Histogram$|^Colormap$/){
         $HASH{$k}={};
         $lastkey =$k;
      }
      elsif($lastkey=~/^Histogram$|^Colormap$/ and $k=~/^\d+$/ ){
         $HASH{$lastkey}->{$k} = $v;
      }
      else {
         $HASH{$k}= $v;
         $lastkey = $k;
      }
   }
   
   return \%HASH;
}


sub palette_rgb_im {   
   my $abs_path = _abs_path($_[0]) or return;
   my $h = identify_im($abs_path) or return;
   my $colors = $h->{Colormap} || $h->{Histogram} ;
   $colors or carp("No Colormap or Historgram in $abs_path") and retur
+n;

   my @colors;
   for ( keys %$colors ){
      my $_line = $colors->{$_};
      $_line=~/\(\s*([0-9]+),\s*([0-9]+),\s*([0-9]+)\)/ or die("cant m
+atch into $_line");
      my ($r,$g,$b) = ($1,$2,$3);
      debug( "$r $g $b");
      #push @colors, "$r$g$b";
      my $rgb = sprintf '%2x%2x%2x', $r, $g , $b;
      push @colors, $rgb;
   }
   return @colors;
}
[download]