Overview
========

Generate cover image from pdf files.

Generate cover image
====================

Try to generate cover image. If something goes wrong None
is returned.

    >>> from eea.converter.tests.utils import get_filedata
    >>> from eea.converter.interfaces import IPDFCoverImage
    >>> from zope.component import getUtility
    >>> gen = getUtility(IPDFCoverImage)

    >>> inp = get_filedata('data/test.pdf', False)
    >>> inp = inp
    >>> inp = gen.generate(inp)
    >>> inp
    'GIF89...'
