CODEWITHSUNDEEP
matplotlibimshow
Jude Gussman
Jude Gussman

Reputation: 21

Matplotlib: Get Rid of White Border

I want to get rid of the white border when I save my image to a png in python.

I tried plt.box(on=None), plt.axis('off'). I tried setting the figure's 'frameon' parameter to false.

import matplotlib.pyplot as plt 
from matplotlib.pyplot import figure


figure(num=None, figsize=(7.965,7.965), dpi=80,facecolor='none',clear=True)
plt.box(on=None)
plt.axis('off')
plt.imshow(Data, cmap='Greys_r', norm=Norm,origin='lower',aspect='auto',interpolation='nearest')

plt.savefig(locationFITSfolder+fitsFile[:-5],transparent=False,bbox=False)

I want there to be no white border to my image. Transparent.

Upvotes: 1

Views: 2319

Answers (1)

ascendants
ascendants

Reputation: 2381

If you change the parameters to the savefig function, you will get the desired output.

Specifically, you must use transparent=True. Note that bbox=False and frameon=False are optional, and only change the width of transparent space around your image.

Adapting from your sample code:

import matplotlib.pyplot as plt 
from matplotlib.pyplot import figure

#create sample data
import numpy as np
Data = np.random.random([4,4])


figure(num=None, figsize=(7.965,7.965), dpi=80,facecolor='none',clear=True)
plt.box(on=None)
plt.axis('off')
plt.imshow(Data, cmap='Greys_r',origin='lower',aspect='auto',interpolation='nearest')

plt.savefig(locationFITSfolder+fitsFile[:-5],transparent=True)

(sidenote -- you may wish to use os.path.join, .split, and .splitext for file I/O, instead of slicing string names)

This yields the expected image output: test image (note that the image has transparent borders when you open it in a new tab or download it).

Upvotes: 1

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