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fix: improve error message when no ImageWriter backend found #8853

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fix: improve error message when no ImageWriter backend found #8853

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1ab9df1
fix: improve error message when no ImageWriter backend found
vikasreddy11 May 13, 2026
a2eb5dc
fix: make ImageWriter error message format-aware for install hints
vikasreddy11 May 13, 2026
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13 changes: 12 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 +116,18 @@ 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}.")
hints = {
"png": "pip install pillow",
"jpg": "pip install pillow",
"jpeg": "pip install pillow",
"nii": "pip install nibabel",
"nii.gz": "pip install nibabel",
"dcm": "pip install itk",
}
hint = hints.get(fmt.lstrip(".").lower(), "pip install pillow or pip install nibabel")
raise OptionalImportError(
f"No ImageWriter backend found for {fmt}. Try: {hint}."
)
writer_tuple = ensure_tuple(avail_writers)
SUPPORTED_WRITERS[fmt] = writer_tuple
return writer_tuple
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