Fix #795

CHANGELOG.md

@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Installing typing-extensions on Python 3.6 and 3.7 ([#775](https://github.com/pdfminer/pdfminer.six/pull/775))
 - `TypeError` in cmapdb.py when parsing null characters ([#768](https://github.com/pdfminer/pdfminer.six/pull/768))
 - Color "convenience operators" now (per spec) also set color space ([#779](https://github.com/pdfminer/pdfminer.six/issues/779))
+- `ValueError` when extracting images, due to breaking changes in Pillow ([#795](https://github.com/pdfminer/pdfminer.six/issues/795))
 
 ### Deprecated
 

pdfminer/image.py

@@ -225,20 +225,24 @@ def _save_bytes(self, image: LTImage) -> str:
         with open(path, "wb") as fp:
             try:
                 from PIL import Image  # type: ignore[import]
+                from PIL import ImageOps
             except ImportError:
                 raise ImportError(PIL_ERROR_MESSAGE)
 
-            mode: Literal["1", "8", "RGB", "CMYK"]
+            mode: Literal["1", "L", "RGB", "CMYK"]
             if image.bits == 1:
                 mode = "1"
             elif image.bits == 8 and channels == 1:
-                mode = "8"
+                mode = "L"
             elif image.bits == 8 and channels == 3:
                 mode = "RGB"
             elif image.bits == 8 and channels == 4:
                 mode = "CMYK"
 
             img = Image.frombytes(mode, image.srcsize, image.stream.get_data(), "raw")
+            if mode == "L":
+                img = ImageOps.invert(img)
+
             img.save(fp)
 
         return name