package Graphics::Magick::ColorHistogram;
use 5.008;
use strict;
use warnings;
use Carp;
require Exporter;
use AutoLoader;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(histogram);
our @EXPORT = qw();
our $VERSION = '1.00';
require XSLoader;
XSLoader::load('Graphics::Magick::ColorHistogram', $VERSION);
1;
__END__
=head1 NAME
Graphics::Magick::ColorHistogram - Calculate color frequency with optional quantization
=head1 SYNOPSIS
use Graphics::Magick::ColorHistogram 'histogram';
# calculate frequency of color in an image
$counts = histogram("image.png"); # { aa77ff => 60, ... }
# quantize image first then count
$counts = histogram("image.jpg", 2); # at most two colors
=head1 FUNCTIONS
=over 4
=item histogram($filename, [$max_colors])
This routine counts the number of times each present color appears in an image.
Optionally, a number of colors can be given and the image data will first be
quantized to have no more than that many colors in it.
The return value is a hashref which maps hex RGB triplets to counts.
=back
=head1 EXPORTS
None by default, C<histogram> at request.
=head1 SEE ALSO
See http://www.graphicsmagick.org/quantize.html for information on how
the quantization is performed.
=head1 AUTHOR
Adam Thomason, E<lt>athomason@cpan.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2011 by Say Media Inc <cpan@saymedia.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.9 or,
at your option, any later version of Perl 5 you may have available.
=cut