diff --git a/src/args.jl b/src/args.jl
index 6fb2bfbb..387a5f1c 100644
--- a/src/args.jl
+++ b/src/args.jl
@@ -493,7 +493,16 @@ function processFillArg(d::Dict, arg)
     arg.color == nothing || (d[:fillcolor] = arg.color == :auto ? :auto : colorscheme(arg.color))
     arg.alpha == nothing || (d[:fillalpha] = arg.alpha)
 
+  # fillrange function
+  elseif trueOrAllTrue(a -> isa(a, Function), arg)
+    d[:fillrange] = arg
+
+  # fillalpha
+  elseif trueOrAllTrue(a -> typeof(a) <: Real && a > 0 && a < 1, arg)
+    d[:fillalpha] = arg
+
   elseif !handleColors!(d, arg, :fillcolor)
+    
     d[:fillrange] = arg
   end
 end
@@ -746,8 +755,6 @@ function getSeriesArgs(pkg::PlottingPackage, plotargs::Dict, kw, commandIndex::I
   c = (c == :match ? d[:linecolor] : getSeriesRGBColor(c, plotargs, plotIndex))
   d[:fillcolor] = c
 
-  # TODO: rebuild
-
   # set label
   label = d[:label]
   label = (label == "AUTO" ? "y$globalIndex" : label)
diff --git a/src/plot.jl b/src/plot.jl
index add8c3ab..a73191ef 100644
--- a/src/plot.jl
+++ b/src/plot.jl
@@ -321,6 +321,14 @@ function createKWargsList(plt::PlottingObject, x, y; kw...)
       d[:linetype] = :path
     end
 
+    # map functions to vectors
+    if isa(d[:zcolor], Function)
+      d[:zcolor] = map(d[:zcolor], d[:x])
+    end
+    if isa(d[:fillrange], Function)
+      d[:fillrange] = map(d[:fillrange], d[:x])
+    end
+
     # cleanup those fields that were used only for generating kw args
     for k in (:idxfilter, :numUncounted, :dataframe)
       delete!(d, k)