While the reading of image for RGB pixel values there is different value of green in

[lisa92]

I want to obtain the pixel values for RGB from image.I did it in Matlab and Python but i obtained different values especially at the green value. I'll appreciate if you have an advice about this matter. Thanks Here is my code in python

from PIL import Image
import numpy as np
 
im = Image.open("lena.jpg")
imPixelVal = np.ones(np.size(im))
imSize = np.size(im)
 
for i in range (0,imSize[0]):
            for j in range (0,imSize[1]):         
                ij = i , j
                p = im.getpixel(ij)
                imPixelVal[i,j] = (0.2989 * p[0]) + (0.5870 * p[1]) + (0.1140 * p[2])
                print p[0]
                print p[1] 
                print p[2]
 

Also this is the code in Matlab:

Im=imread('lena.jpg');
Img = (ones(size(Im,1),size(Im,2))); 
 
for i=1:size(Im,1)
      for j=1:size(Im,2)
                Img(i,j)=0.2989*Im(i,j,1)+0.5870*Im(i,j,2)+0.1140*Im(i,j,3);
      end
end
Im(1,1,1)
Im(1,1,2)
Im(1,1,3)