Add note about the number of interpolated colours

Author: jiho

R/scale-brewer.r

@@ -3,10 +3,11 @@
 #' ColorBrewer provides sequential, diverging and qualitative colour schemes
 #' which are particularly suited and tested to display discrete values (levels
 #' of a factor) on a map. ggplot2 can use those colours in discrete scales. It
-#' also allows to smoothly interpolate the colours to a continuous scale,
-#' although the original colour schemes (particularly the qualitative ones)
-#' were not intended for this. The perceptual result is left to the
-#' appreciation of the user.
+#' also allows to smoothly interpolate 6 colours from any palette to a
+#' continuous scale (6 colours per palette gives nice gradients; more results in
+#' more saturated colours which do not look as good). However, the original
+#' colour schemes (particularly the qualitative ones) were not intended for this
+#' and the perceptual result is left to the appreciation of the user.
 #'
 #' See \url{http://colorbrewer2.org} for more information.
 #'

man/scale_brewer.Rd

@@ -41,10 +41,11 @@ scale_color_distiller(..., type = "seq", palette = 1, values = NULL,
 ColorBrewer provides sequential, diverging and qualitative colour schemes
 which are particularly suited and tested to display discrete values (levels
 of a factor) on a map. ggplot2 can use those colours in discrete scales. It
-also allows to smoothly interpolate the colours to a continuous scale,
-although the original colour schemes (particularly the qualitative ones)
-were not intended for this. The perceptual result is left to the
-appreciation of the user.
+also allows to smoothly interpolate 6 colours from any palette to a
+continuous scale (6 colours per palette gives nice gradients; more results in
+more saturated colours which do not look as good). However, the original
+colour schemes (particularly the qualitative ones) were not intended for this
+and the perceptual result is left to the appreciation of the user.
 }
 \details{
 See \url{http://colorbrewer2.org} for more information.