Hi, Le 17/06/2011 01:42, Peng Du a écrit : > > Is there anyway I can represent the value with level of darkness? change the colormap to a grayscale one : Sgrayplot()//create the figure f=gcf();//figure handle f.color_map=graycolormap(32);// change colormap to grayscale with 32 levels graycolormap(32)// to see what is a colormap ... Philippe.