Adds specific handling for CCITT Group 4, which pikepdf decodes, but not correctly

src/documents/barcodes.py

@@ -20,6 +20,10 @@ from pyzbar import pyzbar
 logger = logging.getLogger("paperless.barcodes")
 
 
+class BarcodeImageFormatError(Exception):
+    pass
+
+
 @lru_cache(maxsize=8)
 def supported_file_type(mime_type) -> bool:
     """
@@ -115,6 +119,9 @@ def scan_file_for_separating_barcodes(filepath: str) -> Tuple[Optional[str], Lis
                 for image_key in page.images:
                     pdfimage = PdfImage(page.images[image_key])
 
+                    if "/CCITTFaxDecode" in pdfimage.filters:
+                        raise BarcodeImageFormatError()
+
                     # Not all images can be transcoded to a PIL image, which
                     # is what pyzbar expects to receive
                     pillow_img = pdfimage.as_pil_image()