Use ImageOutput.geterror.

Author: KelSolaar

colour/io/image.py

@@ -696,8 +696,14 @@ def write_image_OpenImageIO(
         width, height, channels, bit_depth, attributes
     )
 
+    print(image_specification)  # noqa: T201
     image_output = ImageOutput.create(path)
 
+    print(image_output)  # noqa: T201
+
+    if not image_output:
+        print(image_output.geterror())  # noqa: T201
+
     image_output.open(path, image_specification)
     success = image_output.write_image(image)