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Usage: GD::Image::colorAllocate(image, r, g, b) at /home/hesco/sb/GD-G
+raph-Thermometer/lib/GD/Graph/Thermometer.pm line 133.

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package GD::Graph::Thermometer;

...

  return $colors;
}

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#!/usr/bin/perl -w
use strict;
...
    });

1;

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$ ./render_thermometer.pl
$VAR1 = 'GD::Graph::Thermometer';
...
                          ]
        };
Usage: GD::Image::colorAllocate(image, r, g, b) at /home/hesco/sb/GD-G
+raph-Thermometer/lib/GD/Graph/Thermometer.pm line 133.

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Not an ARRAY reference at /home/hesco/sb/GD-Graph-Thermometer/lib/GD/G
+raph/Thermometer.pm line 133.

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  my $text_color;
  if (defined($custom_colors->{text_color})) {
...
  } else {
    $text_color = $self->_black($image);
  }