Grey scale network graph colorings

[Harald Schilly]

Is there a better way to do this?

http://vincent-knight.com/unpeudemath/code/2014/09/24/greyscale-graphs-in-sage/

[Dominique Laurain]

Naive reply : why not use imread and imwrite MATLAB func,for the graph image file ?  ( I didn't try)

http://www.mathworks.com/help/matlab/ref/imwrite.html

example :" Write a 50-by-50 array, A, of grayscale values to a PGN file"

Dominique