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Moved SgiImagePlugin save error to before the start of write operations #2646

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Aug 16, 2017
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Moved SgiImagePlugin save error to before the start of write operations #2646

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10 changes: 5 additions & 5 deletions PIL/SgiImagePlugin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,11 @@ def _save(im, fp, filename):
z = len(im.mode)
if dim == 1 or dim == 2:
z = 1
# assert we've got the right number of bands.
if len(im.getbands()) != z:
raise ValueError("incorrect number of bands in SGI write: %s vs %s" %
(z, len(im.getbands())))

# Minimum Byte value
pinmin = 0
# Maximum Byte value (255 = 8bits per pixel)
Expand Down Expand Up @@ -131,11 +136,6 @@ def _save(im, fp, filename):

fp.write(struct.pack('404s', b'')) # dummy

# assert we've got the right number of bands.
if len(im.getbands()) != z:
raise ValueError("incorrect number of bands in SGI write: %s vs %s" %
(z, len(im.getbands())))

for channel in im.split():
fp.write(channel.tobytes())

Expand Down