Hi all, I was using until now Matlab and its about time for me to move to scikit-image as it provide me more flexibility and a lot of benefits. Normally, I used Matlab to calculate the properties of gray-level co-occurrence matrix as shown in this link ( http://www.mathworks.co.uk/help/images/ref/graycoprops.html) mainly with this simple script: clc; Img = imread('C:\Users\dell\Desktop\ImgTemp\python.jpg'); I=rgb2gray(Img); % Photo downloaded from “http://i425.photobucket.com/albums/pp337/jewarmy/python.jpg” GLCM2 = graycomatrix(I); allst = graycoprops(GLCM2,'all'); contrastInfo = allst.Contrast; display(contrastInfo) energyInfo = allst.Energy; display(energyInfo) homogeneityInfo = allst.Homogeneity; display(homogeneityInfo) correlationInfo = allst.Correlation; display(correlationInfo) With the following output: contrastInfo = 0.2516 energyInfo = 0.1094 homogeneityInfo = 0.8959 correlationInfo = 0.9672 While I was trying to do it with scikit-image using this script: import numpy as np from skimage.io import imread from skimage.feature import greycomatrix, greycoprops image=imread('C:/Users/dell/Desktop/ImgTemp/python.jpg', as_grey=True) g = greycomatrix(image, [0, 1], [0, np.pi/2], levels=256) contrast = greycoprops(g, 'contrast') print('contrast is: ', contrast) energy = greycoprops(g, 'energy') print('energy is: ', energy) homogeneity = greycoprops(g, 'homogeneity') print('homogeneity is: ', homogeneity) correlation = greycoprops(g, 'correlation') print('correlation is: ', correlation) dissimilarity = greycoprops(g, 'dissimilarity') print('dissimilarity is: ', dissimilarity) ASM = greycoprops(g, 'ASM') print('ASM is: ', ASM) I get these results: contrast is: [[0 0] [0 0]] energy is: [[ 40007.37212065 40007.37212065] [ 38525.88698525 38017.06358992]] homogeneity is: [[ 165440. 165440.] [ 165088. 164970.]] correlation is: [[ 1. 1.] [ 1. 1.]] dissimilarity is: [[0 0] [0 0]] ASM is: [[1600589824 1600589824] [1484243968 1445297124]] I do not understand why there are differences and for sure I miss something. Can someone please explain me what is wrong (I am using python 3.2 and scikit-image 0.8.3). Thanks a lot in advance.