Clarified spec

dlib/image_transforms/colormaps_abstract.h

@@ -65,7 +65,7 @@ namespace dlib
         ensures
             - Interprets img as a grayscale image and returns a new matrix which represents
               a colored version of img.  In particular, the colormap is defined by
-              colormap_heat().
+              out_color = colormap_heat(grayscale_pixel_value, min_val, max_val).
             - The returned matrix will have the same dimensions as img.
     !*/
 
@@ -117,7 +117,7 @@ namespace dlib
         ensures
             - Interprets img as a grayscale image and returns a new matrix which represents
               a colored version of img.  In particular, the colormap is defined by
-              colormap_jet().
+              out_color = colormap_jet(grayscale_pixel_value, min_val, max_val).
             - The returned matrix will have the same dimensions as img.
     !*/