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Warn that tobytes is not for compressed image data #1470

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Merged
wiredfool merged 1 commit into from
Oct 12, 2015
Merged

Warn that tobytes is not for compressed image data #1470

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8 changes: 7 additions & 1 deletion PIL/Image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -647,7 +647,13 @@ def __setstate__(self, state):

def tobytes(self, encoder_name="raw", *args):
"""
Return image as a bytes object
Return image as a bytes object.

.. warning::

This method is for raw-ish output, for compressed image
data (e.g. PNG, JPEG) use :meth:`~.save`, with a BytesIO
parameter for in-memory data.

:param encoder_name: What encoder to use. The default is to
use the standard "raw" encoder.
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