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fix: avoid saving empty .zip archive #1242

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fix: avoid saving empty .zip archive #1242

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4 changes: 4 additions & 0 deletions cellpose/io.py
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Original file line number Diff line number Diff line change
Expand Up @@ -648,6 +648,10 @@ def save_rois(masks, file_name, multiprocessing=None):
Returns:
None
"""
if masks.max() == 0:
io_logger.warning("no masks found, will not save ImageJ ROIs to .zip archive")
return

outlines = utils.outlines_list(masks, multiprocessing=multiprocessing)
nonempty_outlines = [outline for outline in outlines if len(outline)!=0]
if len(outlines)!=len(nonempty_outlines):
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