Add Indexed color space support

PyPDF2/filters.py

@@ -570,7 +570,21 @@ def _xobj_to_image(x_object_obj: Dict[str, Any]) -> Tuple[Optional[str], bytes]:
  if SA.FILTER in x_object_obj:
  if x_object_obj[SA.FILTER] == FT.FLATE_DECODE:
  extension = ".png"
+ color_space = None
+ if "/ColorSpace" in x_object_obj:
+ color_space = x_object_obj["/ColorSpace"].get_object()
+ if (
+ isinstance(color_space, ArrayObject)
+ and color_space[0] == "/Indexed"
+ ):
+ color_space, base, hival, lookup = (
+ value.get_object() for value in color_space
+ )
+
  img = Image.frombytes(mode, size, data)
+ if color_space == "/Indexed":
+ img.putpalette(lookup.get_data())
+ img = img.convert("RGB")
  if G.S_MASK in x_object_obj: # add alpha channel
  alpha = Image.frombytes("L", size, x_object_obj[G.S_MASK].get_data())
  img.putalpha(alpha)