text: import numpy as np
  import os
  
  from PIL import Image
  
  from manimlib.constants import RASTER_IMAGE_DIR
  
  
  def get_full_raster_image_path(image_file_name):
      possible_paths = [
          image_file_name,
          os.path.join(RASTER_IMAGE_DIR, image_file_name),
          os.path.join(RASTER_IMAGE_DIR, image_file_name + ".jpg"),
          os.path.join(RASTER_IMAGE_DIR, image_file_name + ".png"),
          os.path.join(RASTER_IMAGE_DIR, image_file_name + ".gif"),
      ]
      for path in possible_paths:
          if os.path.exists(path):
              return path
      raise IOError("File %s not Found" % image_file_name)
  
  
  def drag_pixels(frames):
      curr = frames[0]
      new_frames = []
      for frame in frames:
          curr += (curr == 0) * np.array(frame)
          new_frames.append(np.array(curr))
      return new_frames
  
  
  def invert_image(image):
      arr = np.array(image)
      arr = (255 * np.ones(arr.shape)).astype(arr.dtype) - arr
      return Image.fromarray(arr)
  