glcm NumLevels issue
===

in matlab glcm page it describes how glcm matrices are created
http://www.mathworks.in/help/toolbox/images/ref/graycomatrix.html


If you take a 8 bit grayscale image the binary values range from 0 - 255

What iam concerned about is a image should have zero values and shouldn't the GLCM matrix start with 0 and end with 7 rather than 1 to 8 ? 