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Graphics-Magick-ColorHistogram-1.00
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/ Graphics::Magick::ColorHistogram

NAME

Graphics::Magick::ColorHistogram - Calculate color frequency with optional quantization

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

FUNCTIONS

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.

EXPORTS

None by default, histogram at request.

SEE ALSO

See http://www.graphicsmagick.org/quantize.html for information on how the quantization is performed.

AUTHOR

Adam Thomason, <athomason@cpan.org>

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.