code: def resize_image(self, path, im):
          
          # Get the original filename
          _, filename = os.path.split(path)
  
          # Generate the new filename
          filename = self.get_safe_filename(filename)
          filename = '%s%s' % (self.prefix if self.prefix else '', filename)
  
          # Get the original image size
          w, h = im.size
  
          # Generate assets from the source image
          for d in DENSITY_TYPES:
              if d == 'ldpi' and not self.ldpi:
                  continue  # skip ldpi
              if d == 'xxxhdpi' and not self.xxxhdpi:
                  continue  # skip xxxhdpi
  
              out_file = os.path.join(self.out,
                      self.get_out_for_density(d), filename)
  
              if d == self.source_density:
                  im.save(out_file, quality=self.image_quality)
              else:
                  size = (self.get_size_for_density(w, d),
                          self.get_size_for_density(h, d))
                  im.resize(size, self.image_filter).save(out_file,
                          quality=self.image_quality)
docs: Generate assets from the given image and path in case you've already
          called Image.open