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              'graph_top' => 22,
              'image' => '#PNG
                         [...lots of binary rubbish your terminal won't like...]
                         ',
              'graph_start' => 1217855462
            };

    In this case, the option (image => "-") has been used to create the hash
    key with the same name, the value of which actually contains the BLOB of
    the image itself. This is useful when image needs to be passed to other
    modules (e.g. Image::Magick), instead of writing it to disk. Be aware
    that rrdtool 1.3 is required for "graphv" to work.

  Error Handling
    By default, "RRDTool::OO"'s methods will throw fatal errors (as in:
    they're calling "die") if the underlying "RRDs::*" commands indicate
    failure.

    This behaviour can be overridden by calling the constructor with the
    "raise_error" flag set to false:

lib/RRDTool/OO.pm  view on Meta::CPAN

          'image_width' => 91,
          'graph_top' => 22,
          'image' => '#PNG
                     [...lots of binary rubbish your terminal won't like...]
                     ',
          'graph_start' => 1217855462
        };

In this case, the option (image => "-") has been used to create the hash key
with the same name, the value of which actually contains the BLOB of the image itself.
This is useful when image needs to be passed to other modules (e.g. Image::Magick),
instead of writing it to disk.
Be aware that rrdtool 1.3 is required for C<graphv> to work.

=head2 Error Handling

By default, C<RRDTool::OO>'s methods will throw fatal errors (as in: 
they're calling C<die>) if the underlying C<RRDs::*> commands indicate
failure.

This behaviour can be overridden by calling the constructor with