@property
    def crop_thumb(self):
        from cropduster.models import Thumb

        try:
            pil_img = PIL.Image.open(self.file_path)
        except:
            return None
        orig_w, orig_h = pil_img.size
        dimensions = self.get('Regions', {}).get('AppliedToDimensions', None)

        if not isinstance(dimensions, dict):
            return None
        w, h = dimensions.get('w'), dimensions.get('h')
        if not all(map(lambda v: isinstance(v, int), [w, h])):
            return None
        region_list = self.get('Regions', {}).get('RegionList', [])
        if not isinstance(region_list, list):
            return None
        try:
            crop_region = [r for r in region_list if r['Name'] == 'Crop'][0]
        except __HOLE__:
            return None
        if not isinstance(crop_region, dict) or not isinstance(crop_region.get('Area'), dict):
            return None
        area = crop_region.get('Area')
        # Verify that all crop area coordinates are floats
        if not all([isinstance(v, float) for k, v in area.items() if k in ('w', 'h', 'x', 'y')]):
            return None

        return Thumb(
            name="crop",
            crop_x=area['x'] * w,
            crop_y=area['y'] * h,
            crop_w=area['w'] * w,
            crop_h=area['h'] * h,
            width=orig_w,
            height=orig_h)
dataset/ETHPy150Open theatlantic/django-cropduster/cropduster/standalone/metadata.py/MetadataDict.crop_thumb