diff --git a/src/series.jl b/src/series.jl
index f7233c1a..f1ee5739 100644
--- a/src/series.jl
+++ b/src/series.jl
@@ -317,9 +317,10 @@ end
 # # images - colors
 
 @recipe function f{T<:Colorant}(mat::AMat{T})
+	n, m = size(mat)
+	
     if is_seriestype_supported(:image)
         seriestype := :image
-        n, m = size(mat)
         SliceIt, 1:m, 1:n, Surface(mat)
     else
         seriestype := :heatmap