Repository navigation
Cannot write JPG images anymore with Pillow 4.2 #9585
Description
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.
Activity
tacaswell commentedon Oct 26, 2017
What version of Matplotlib?
Something like this went by recently....
tacaswell commentedon Oct 26, 2017
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
tacaswell commentedon Oct 26, 2017
Can you try with 2.1?
anntzer commentedon Oct 26, 2017
this seems to have been fixed somewhere between 1.5.3 and 2.1
tacaswell commentedon Oct 26, 2017
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.