def __init__(self):
self.items = defaultdict(PanelStrip)
self.width = Raster.image_width(PanelVisual.background_image)
def __init__(self, image_file, ignore_background=False, overlay=False):
self.width = Raster.image_width(image_file)
self.image_file = image_file
self.ignore_background = ignore_background
self.overlay = overlay
