display an rgb matrix image in python

Question

I have an rgb matrix something like this:

image=[[(12,14,15),(23,45,56),(,45,56,78),(93,45,67)],
       [(r,g,b),(r,g,b),(r,g,b),(r,g,b)],
       [(r,g,b),(r,g,b),(r,g,b),(r,g,b)],
       ..........,
       [()()()()]
      ]

i want to display an image which contains the above matrix.

I used this function to display a gray-scale image:

def displayImage(image):
    displayList=numpy.array(image).T
    im1 = Image.fromarray(displayList)
    im1.show()

argument(image)has the matrix

anybody help me how to display the rgb matrix

doug · Accepted Answer · 2014-04-01 06:08:50Z

9

imshow in the matplotlib library will do the job

what's critical is that your NumPy array has the correct shape:

height x width x 3

(or height x width x 4 for RGBA)

>>> import os
>>> # fetching a random png image from my home directory, which has size 258 x 384
>>> img_file = os.path.expanduser("test-1.png")

>>> from scipy import misc
>>> # read this image in as a NumPy array, using imread from scipy.misc
>>> M = misc.imread(img_file)

>>> M.shape       # imread imports as RGBA, so the last dimension is the alpha channel
    array([258, 384, 4])

>>> # now display the image from the raw NumPy array:
>>> from matplotlib import pyplot as PLT

>>> PLT.imshow(M)
>>> PLT.show()

answered Apr 1, 2014 at 6:08

doug

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Comments

slongfield · Accepted Answer · 2014-04-01 07:03:28Z

4

Matplotlib's built in function imshow will let you do this.

import matplotlib.pyplot as plt
def displayImage(image):
    plt.imshow(image)
    plt.show()

edited Apr 1, 2014 at 7:03

answered Apr 1, 2014 at 6:05

slongfield

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3 Comments

user3320033 Over a year ago

this code executes without error but doesn't show me any error

slongfield Over a year ago

If you aren't saving the image with matplotlib, but want to open the image, you need to add in "plt.show()". I've edited the original answer to reflect this.

JeffHeaton Over a year ago

This has a strang white bounding box and also axis

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