Convert image to a digital matrix using python

Question

I have an image "felix.png" (280x280).

and I'm converting this image to digital matrix:

from PIL import Image
from numpy import array




img = Image.open('felix.png')
arr = array(img)

the shape of this array is (280,280,3) and I wonder why each pixel is represented with 3 dimensional array?

for example arr[0][0] is [255,255,255]...

Hannes Ovrén · Accepted Answer · 2015-01-28 13:27:54Z

5

Because it is a color image. The third dimension is color. thus

r = arr[:,:,0]
g = arr[:,:,1]
b = arr[:,:,2]

if PIL opens the image as RGB.

This means a red pixel at point (x,y) would be [255, 0, 0], and a white pixel [255, 255, 255].

answered Jan 28, 2015 at 13:27

Hannes Ovrén

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