How to compute the scaled version of gray scale image

Method graycomatrix returns a glcm and a sclaed version of input image. I was just wondering how to scale the image to 8 gray scales. Also, I want some clarity on Energy obtained from this glcm. Energy needs to have values between 0 and 1 where 1 represents that the image is constant. So, can I say that Energy value closed to 0 is desired and this represents high energy ??

Please help

Answer 1

[Devineni Aslesha]

The ‘NumLevels’ property in ‘graycomatrix’ function scales the image to 8 gray scales as the default value of ‘NumLevels’ is 8. The maximum value of energy is ‘1’ which is obtained for a constant image.

[Gunjan Gautam]

Sorry but I did not get the answer of my question.