Generates a colormap with linear luminance, linear hue and constant saturation.
RGB = colormapgen() generates "mauricio" colormap.

RGB = colormapgen(M,G1,G2,H1,H2,S) generates a colormap with M colors, with luminance or grayscale [0,1] from G1 to G2, with hue [0,360] from H1 to H2, and with saturation S [0,1].

colormapgen() plots a sample of the generated colormap.

Example: mauricio = colormapgen(64,0.2,0.9,300,-60,0.9);