Don't color points

src/recipes.jl

@@ -1024,9 +1024,13 @@ end
     @assert length(g.args) == 1 && typeof(g.args[1]) <: AbstractMatrix
     seriestype := :spy
     mat = g.args[1]
-    if length(unique(mat[mat .!= 0])) < 2
+    lunique = length(unique(mat[mat .!= 0]))
+    if lunique == 2
         legend --> nothing
         seriescolor --> cgrad([invisible(), fg_color(plotattributes)])
+    elseif lunique < 2
+        legend --> nothing
+        seriescolor --> fg_color(plotattributes)
     end
     n,m = size(mat)
     Plots.SliceIt, 1:m, 1:n, Surface(mat)
@@ -1045,7 +1049,7 @@ end
         markersize := 1.5
     end
     markerstrokewidth := 0
-    marker_z := zs
+    #marker_z := zs
     label := ""
     x := cs
     y := rs