Hi All, Pillow provides the Python Imaging Library (PIL) https://pillow.readthedocs.io/en/stable/ and is a standard package in Sage.
Now, in Sage 10.2.rc3, the following code g = plot(sin(x)) # to generate a png figure g.save("fig.png") # from PIL import Image img = Image.open("fig.png") img_rgb = img.convert("RGB") img_rgb.save("fig.jpg") returns OSError: encoder jpeg not available This is actually not surprising since the file SAGE_ROOT/build/pkgs/pillow/spkg-install.in contains the line: PILLOW_CONFIG_SETTINGS="-C debug=true -C jpeg=disable $PILLOW_CONFIG_SETTINGS" Is there any reason for "jpeg=disable" ? Providing PIL without jpeg support seems quite weird... This issue is not new and was already noticed already 5 years ago: https://ask.sagemath.org/question/43298 A side effect of this is that the IPyhon rendering of PIL Images via the rich output mechanism is broken in Sage 10.2.rc3 (but, for some reasons, not in Sage 10.1): in a Jupyter notebook, typing img = Image.open("fig.png") img does display the image but after an error message terminating by ValueError: Could not save to JPEG for display There is no such error message in Sage 10.1 If we agree to restore jpeg support in Pillow, I have prepared a branch that does this for Sage 10.2 (simply suppressing the option "jpeg=disable"): https://github.com/egourgoulhon/sage/tree/pillow_jpeg and I am happy to submit a PR for this. Eric. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/e1a2bf34-d3e5-492b-942c-33b1fc8c3254n%40googlegroups.com.