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ghost opened this issue Oct 26, 2017 · 7 comments
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Cannot write JPG images anymore with Pillow 4.2 #9585

ghost opened this issue Oct 26, 2017 · 7 comments
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v2.1.1

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@ghost
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ghost commented Oct 26, 2017

Hi,
Due to issue python-pillow/Pillow#2609 , I cannot save anymore my Matplotlib graphs to JPG format (with the alpha layers merged together) since Conda upgraded Pillow to version 4.2. This used to work before:

self._fig.savefig(file_name, dpi=dpi, bbox_inches='tight', bbox_extra_artists=bbox_extra_artists, pad_inches=.4)
File "/path/to/Conda-linux-x64/lib/python2.7/site-packages/matplotlib/figure.py", line 1565, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/path/to/Conda-linux-x64/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 2232, in print_figure
**kwargs)
File "/path/to/Conda-linux-x64/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 583, in print_jpg
return image.save(filename_or_obj, format='jpeg', **options)
File "/path/to/Conda-linux-x64/lib/python2.7/site-packages/PIL/Image.py", line 1893, in save
save_handler(self, fp, filename)
File "/path/to/Conda-linux-x64/lib/python2.7/site-packages/PIL/JpegImagePlugin.py", line 604, in _save
raise IOError("cannot write mode %s as JPEG" % im.mode)
IOError: cannot write mode RGBA as JPEG

Downgrading to Pillow 4.1 (conda install pillow=4.1)makes this code work.
Is it possible to force the merge of the alpha channel before or when writing? Adding , transparent=False to savefig did not help.
I guess that feature python-pillow/Pillow#2663 will fix this problem.
Thanks.
@tacaswell tacaswell added this to the v2.1.1 milestone Oct 26, 2017
@tacaswell
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What version of Matplotlib?

Something like this went by recently....

@tacaswell
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This is documented in pillow's release notes https://github.com/python-pillow/Pillow/blob/master/docs/releasenotes/4.2.0.rst#removed-deprecated-items

@ghost
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ghost commented Oct 26, 2017

This happens with matplotlib 1.5.1 (python 2.7.14).

@tacaswell
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Can you try with 2.1?

@anntzer
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anntzer commented Oct 26, 2017

this seems to have been fixed somewhere between 1.5.3 and 2.1

@tacaswell
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Fixed by #5324 which is included in 2.0

@sebastienaubry Thanks for taking the time to report this. It should work if you update to at least 2.0.

@ghost
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ghost commented Oct 26, 2017

Hi,
Indeed, it works under 2.1.0.
Thanks

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