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Fix: add package install hint to ImageWriter backend error message #8795

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Fix: add package install hint to ImageWriter backend error message #8795

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a517854
Fix: add package install hint to ImageWriter backend error message
Talhax55z Mar 29, 2026
1198bd9
Fix: derive supported formats dynamically in ImageWriter error message
Talhax55z Mar 29, 2026
4029c61
Fix: exclude wildcard key from supported formats hint in error message
Talhax55z Mar 29, 2026
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7 changes: 6 additions & 1 deletion monai/data/image_writer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -116,7 +116,12 @@ def resolve_writer(ext_name, error_if_not_found=True) -> Sequence:
except Exception: # other writer init errors indicating it exists
avail_writers.append(_writer)
if not avail_writers and error_if_not_found:
raise OptionalImportError(f"No ImageWriter backend found for {fmt}.")
_supported = ", ".join(sorted(k for k in SUPPORTED_WRITERS.keys() if k != "*"))
raise OptionalImportError(
f"No ImageWriter backend found for {fmt}. "
f"Supported formats: {_supported}. "
f"Please install a suitable package such as 'nibabel', 'itk', or 'Pillow'."
)
writer_tuple = ensure_tuple(avail_writers)
SUPPORTED_WRITERS[fmt] = writer_tuple
return writer_tuple
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