Added sample "with rgbimage" plot

Author: dkogan

gnuplotlib.py

@@ -375,15 +375,21 @@ class gnuplotlib has a separate gnuplot process and a plot window. If multiple
 Also, note that while the DEFAULT tuplesize depends on whether we're making a 3D
 plot, once a tuplesize is given, the logic doesn't care if a 3D plot is being
 made. It can make sense to have a 2D implicit domain when making 2D plots. For
-example, one can be plotting a color map:
+example, one can be plotting a color map from an array of shape (H,W):
 
     x,y = np.ogrid[-10:11,-10:11]
     gp.plot( x**2 + y**2,
              title     = 'Heat map',
-             set       = 'view map',
              _with     = 'image',
              tuplesize = 3)
 
+Or a full-color image from an array of shape (H,W,3)
+
+    gp.plot( *nps.mv(image, -1,0),
+             title     = 'Full-color image',
+             _with     = 'rgbimage',
+             tuplesize = 5)
+
 Also note that the 'tuplesize' curve option is independent of implicit domains.
 This option specifies not how many data arrays we have, but how many values
 represent each data point. For example, if we want a 2D line plot with varying
@@ -1036,7 +1042,6 @@ class gnuplotlib has a separate gnuplot process and a plot window. If multiple
     x,y = np.ogrid[-10:11,-10:11]
     gp.plot( x**2 + y**2,
              title     = 'Heat map',
-             set       = 'view map',
              _with     = 'image',
              tuplesize = 3)