How to use the sigal.gallery.Image function in sigal

def test_media_iptc_override(settings):
    img_with_md = Image('2.jpg', 'iptcTest', settings)
    assert img_with_md.title == "Markdown title beats iptc"
    # Markdown parsing adds formatting. Let's just focus on content
    assert "Markdown description beats iptc" in img_with_md.description
    img_no_md = Image('1.jpg', 'iptcTest', settings)
    assert img_no_md.title == 'Haemostratulus clouds over Canberra - ' + \
            '2005-12-28 at 03-25-07'
    assert img_no_md.description == \
            '"Haemo" because they look like haemoglobin ' + \
            'cells and "stratulus" because I can\'t work out whether ' + \
            'they\'re Stratus or Cumulus clouds.\nWe\'re driving down ' + \
            'the main drag in Canberra so it\'s Parliament House that ' + \
            'you can see at the end of the road.'

def test_media_iptc_override(settings):
    img_with_md = Image('2.jpg', 'iptcTest', settings)
    assert img_with_md.title == "Markdown title beats iptc"
    # Markdown parsing adds formatting. Let's just focus on content
    assert "Markdown description beats iptc" in img_with_md.description
    img_no_md = Image('1.jpg', 'iptcTest', settings)
    assert img_no_md.title == 'Haemostratulus clouds over Canberra - ' + \
            '2005-12-28 at 03-25-07'
    assert img_no_md.description == \
            '"Haemo" because they look like haemoglobin ' + \
            'cells and "stratulus" because I can\'t work out whether ' + \
            'they\'re Stratus or Cumulus clouds.\nWe\'re driving down ' + \
            'the main drag in Canberra so it\'s Parliament House that ' + \
            'you can see at the end of the road.'

def test_image(settings, tmpdir):
    settings['destination'] = str(tmpdir)
    settings['datetime_format'] = '%d/%m/%Y'
    m = Image('11.jpg', 'dir1/test1', settings)
    assert m.date == datetime.datetime(2006, 1, 22, 10, 32, 42)
    assert m.exif['datetime'] == '22/01/2006'

    os.makedirs(join(settings['destination'], 'dir1', 'test1', 'thumbnails'))
    assert m.thumbnail == join('thumbnails', '11.tn.jpg')
    assert os.path.isfile(m.thumb_path)

assert m.big is None

    settings['keep_orig'] = True
    settings['destination'] = str(tmpdir)

    m = Image('11.jpg', 'dir1/test1', settings)
    assert m.big == 'original/11.jpg'

    m = Video('example video.ogv', 'video', settings)
    assert m.filename == 'example video.webm'
    assert m.big_url == 'original/example%20video.ogv'
    assert os.path.isfile(join(settings['destination'], m.path, m.big))

    settings['use_orig'] = True

    m = Image('21.jpg', 'dir1/test2', settings)
    assert m.big == '21.jpg'

def test_media_orig(settings, tmpdir):
    settings['keep_orig'] = False
    m = Media('11.jpg', 'dir1/test1', settings)
    assert m.big is None

    settings['keep_orig'] = True
    settings['destination'] = str(tmpdir)

    m = Image('11.jpg', 'dir1/test1', settings)
    assert m.big == 'original/11.jpg'

    m = Video('example video.ogv', 'video', settings)
    assert m.filename == 'example video.webm'
    assert m.big_url == 'original/example%20video.ogv'
    assert os.path.isfile(join(settings['destination'], m.path, m.big))

    settings['use_orig'] = True

    m = Image('21.jpg', 'dir1/test2', settings)
    assert m.big == '21.jpg'

def _get_metadata(self):
        super(Image, self)._get_metadata()
        # If a title or description hasn't been obtained by other means, look
        #  for the information in IPTC fields
        if self.title and self.description:
            # Nothing to do - we already have title and description
            return

        try:
            iptc_data = get_iptc_data(self.src_path)
        except Exception as e:
            self.logger.warning('Could not read IPTC data from %s: %s',
                                self.src_path, e)
        else:
            if not self.title and iptc_data.get('title'):
                self.title = iptc_data['title']
            if not self.description and iptc_data.get('description'):
                self.description = iptc_data['description']

# optionally add index.html to the URLs
        self.url_ext = self.output_file if settings['index_in_url'] else ''

        self.index_url = url_from_path(os.path.relpath(
            settings['destination'], self.dst_path)) + '/' + self.url_ext

        #: List of all medias in the album (:class:`~sigal.gallery.Image` and
        #: :class:`~sigal.gallery.Video`).
        self.medias = medias = []
        self.medias_count = defaultdict(int)

        for f in filenames:
            ext = splitext(f)[1]
            if ext.lower() in settings['img_extensions']:
                media = Image(f, self.path, settings)
            elif ext.lower() in settings['video_extensions']:
                media = Video(f, self.path, settings)
            else:
                continue

            self.medias_count[media.type] += 1
            medias.append(media)

        signals.album_initialized.send(self)