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radarhere · Dec 28, 2024 · 3666351 · 3666351
1 parent 439d5cf
commit 3666351
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/PIL/Jpeg2KImagePlugin.py b/src/PIL/Jpeg2KImagePlugin.py
@@ -266,6 +266,8 @@ def _open(self) -> None:
             else:
                 msg = "not a JPEG 2000 file"
                 raise SyntaxError(msg)
+        if self.mode == "CMYK":
+            assert False
 
         self._reduce = 0
         self.layers = 0