Consider implementing _repr_png_ for the Image object

[payne92]

Given the popularity of IPython, consider implementing a _repr_png_() method for the Image object, which just returns the object in PNG form. If this method exists on an object, the IPython notebook will display the rich image representation in-line.

See: http://nbviewer.ipython.org/github/adrn/ipython/blob/1.x/examples/notebooks/Part%205%20-%20Rich%20Display%20System.ipynb

This can be done without dependency on or reference to IPython.

[wiredfool]

I've got a branch with that method in it now, (https://github.com/wiredfool/Pillow/tree/repr_png) but it does not seem to trigger iPython's display hooks. Can you give a step by step to test it, or determine what else needs to be added to make it work?

[payne92]

The method is _repr_png_() -- your implementation is missing the trailing underscore in the name.

To test in an IPython web notebook:

from PIL import Image
im = Image.new("RGB", (512, 512), "blue")
im

IPython will attempt to render the last value. When it finds _repr_png_(), it will render it.

[hugovk]

The problem was GitHub interpreted the underscores as italic markup. I've edited to wrap backticks ` around the function to make sure it's in code markup!

[payne92]

Ah, my bad -- sorry about that. I should have checked the preview more carefully.

[wiredfool]

Ah, much better. Works now.

[hugovk]

Implemented via #1091, thanks.