I want to calculate the texture properties of The soap only, but when I use the code below it Calculates the texture of the whole image I have also tried to use regionprops but regionprops doesn’t have the properties for texture

    RGB=imread('soap105.jpg');
RGB=imresize(RGB,[160 190]);
I=rgb2gray(RGB);
     .
After some gray level enhancement
     . 
I2=graycomatrix(I)
I3=graycoprops (I2, all )

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Duplicate post to: http://www.mathworks.com/matlabcentral/answers/144384-how-can-i-calculate-the-texture-of-the-soap-only-on-the-picture-below