[Matplotlib-users] (no subject)

[David Bourgeois]

Indeed, it works with Qt.

I'm going to report this as a bug then.
Thank you,
David

On Wed, Jan 13, 2016 at 12:29 PM, Jens Nielsen <jenshnielsen at gmail.com>
wrote:

> It looks like a bug in the OSX backend. I can reproduce with the OSX
> backend but it looks correct with any other backend that also explains why
> the saved images looks correct.
> If you have other GUI toolkits installed you can switch by adding
>
> import matplotlib
> matplotlib.use('Qt4Agg') #Or any other backend
>
> before importing pyplot the first time
>
> best
> Jens
>
> On Wed, 13 Jan 2016 at 11:08 David Bourgeois <david at jaguarondi.com> wrote:
>
>> In Matplotlib, images and patches are shown on screen with different
>> color rendering, at least with my setup. The following script displays an
>> image of a grayscale (np.array) overlaid at the center with the same
>> grayscale generated from matplotlib.patches.
>>
>> There is a difference of gamma between the image and the patches on
>> what's displayed on screen but if I save this figure, then the resulting
>> file is correct. Checking with some graphic software, the patches are
>> displaying the correct color, not the image.
>>
>> Snapshot:
>> http://i.stack.imgur.com/mv8aU.jpg
>>
>> Saving the figure from the figure window 'save' button gives this:
>> http://i.stack.imgur.com/fVNnh.png
>>
>> Is there anything I'm missing in this code?
>>
>>     import numpy as np
>>     import matplotlib.pyplot as plt
>>     from matplotlib.patches import Rectangle
>>
>>     color = np.zeros(3)
>>
>>     f, ax = plt.subplots()
>>     im = np.zeros((1000, 1100,3))
>>     for i in range(11):
>>         im[:,i*100:(i+1)*100,:] = np.tile(np.array([[color]]), (1000,
>> 100, 1))
>>         ax.add_patch(Rectangle((i*100,300), 100, 400, linewidth=0,
>> facecolor=color))
>>         color = color + 0.1
>>     plt.imshow(im)
>>     plt.show()
>>
>> I'm on OSX, so I also checked the color management and by changing the
>> color profile of my display, both image and patches are affected so I guess
>> color management is not where the problem lies.
>>
>> Thank you,
>> David
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>>
>
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