- NAME OVERRIDE
- SEE ALSO
- LICENSE AND COPYRIGHT
Imager::Filter::Autocrop - Automatic crop filter for Imager.
use Imager; use Imager::Filter::Autocrop; my $img = Imager->new(); $img->read(file => 'image.jpg'); $img->filter(type => 'autocrop') or die $img->errstr;
This module extends
Imager functionality with the autocrop filter, similar to ImageMagick and GraphicsMagick "trim". It does have a few additional features as well, such as support for the border or detection-only mode. The distribution also includes a command-line script autocrop.pl.
Note: If the image looks blank (whether genuinely or because of the 'fuzz' parameter), or if there is nothing to crop, then the filter call will return false and the 'errstr' method will return appropriate message.
You can change the name under which the filter is registered, by specifying it in 'use' directive. For example, to change the name to 'trim' from the default 'autocrop':
use Imager; use Imager::Filter::Autocrop 'trim'; $img->filter(type => 'trim') or die $img->errstr;
By default the color of the top left pixel is used for cropping. You can explicitly specify one though, by either providing the '#RRGGBB' value or passing an object of
Imager::Colorclass or its subclass.
# The following two calls are identical. $img->filter(type => 'autocrop', color => "#FFFFFF"); $img->filter(type => 'autocrop', color => Imager::Color->new(255, 255, 255));
You can specify the deviation for the color value (for all RGB channels or the main channel if it is a greyscale image), by using the 'fuzz' parameter. All image colors within the range would be treated as matching candidates for cropping.
$img->filter(type => 'autocrop', fuzz => 20);
You can specify the border around the image for cropping. If the cropping area with the border is identical to the original image height and width, then no actual cropping will be done.
$img->filter(type => 'autocrop', border => 10);
Finally, you can just detect the cropping area by passing a hash reference as a 'detect' parameter. On success, your hash will be set with left, right, top and bottom keys and appropriate values. Please note that if the 'border' parameter is used, the detected area values will be adjusted appropriately.
my %points = (); $img->filter(type => 'autocrop', detect => \%points);
<leader at cpan.org> Domain Knowledge Ltd. https://do-know.com/
Please report any bugs or feature requests to
bug-imager-filter-autocrop at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Imager-Filter-Autocrop. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
You can find documentation for this module with the perldoc command.
You can also look for information at:
RT: CPAN's request tracker (report bugs here)
AnnoCPAN: Annotated CPAN documentation
Copyright 2016 Alexander Yezhov.
This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License (2.0). You may obtain a copy of the full license at:
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