Pyplot.imshow() "None" interpolation is not supported on Mac OSX

[kennysong]

When passing in interpolation='none' to the imshow() function, I get the following error:

/usr/local/lib/python2.7/site-packages/matplotlib/image.py:649: UserWarning: The backend (<class 'matplotlib.backends.backend_macosx.RendererMac'>) does not support interpolation='none'. The image will be interpolated with 'nearest` mode.

I'm on Mac OS X 10.10.3, Python 2.7.9. It seems strange that the no interpolation mode would not be supported here.

[tacaswell]

attn @mdehoon

[WeatherGod]

Interpolation 'none' is essentially the same thing as "nearest". The issue
is whether to let the native backend handle it ('none') or to have it taken
care of in AGG ('nearest'). The results are the same, although it tends to
be that the native backends can handle this more efficiently. I don't
remember why macosx backend wasn't set up to handle 'none', though.

On Fri, Apr 10, 2015 at 9:28 AM, Thomas A Caswell notifications@github.com
wrote:

attn @mdehoon https://github.com/mdehoon

—
Reply to this email directly or view it on GitHub
#4320 (comment)
.

[mdehoon]

I think this is fairly easy to solve, but I am having difficulty understanding what draw_image is supposed to do. If draw_image gets a transformation matrix, then why are the arguments dx, dy needed?

[WeatherGod]

I don't know. Maybe @mdboom knows?

On Sun, Apr 12, 2015 at 12:27 AM, mdehoon notifications@github.com wrote:

I think this is fairly easy to solve, but I am having difficulty
understanding what draw_image is supposed to do. If draw_image gets a
transformation matrix, then why are the arguments dx, dy needed?

—
Reply to this email directly or view it on GitHub
#4320 (comment)
.

[breedlun]

I have at least one example where 'none' is not the same as 'nearest'. Check out:
http://matplotlib.org/examples/images_contours_and_fields/interpolation_none_vs_nearest.html

[WeatherGod]

Ah, right. The PDF backend does treat them differently, I forgot about that.

On Fri, Apr 17, 2015 at 10:20 AM, Benjamin Reedlunn <
notifications@github.com> wrote:

I have at least one example where 'none' is not the same as 'nearest'.
Check out:

http://matplotlib.org/examples/images_contours_and_fields/interpolation_none_vs_nearest.html

—
Reply to this email directly or view it on GitHub
#4320 (comment)
.

[mdboom]

Fixed by #6178