diff --git a/main.go b/main.go
index b7a9450..05266ea 100644
--- a/main.go
+++ b/main.go
@@ -50,8 +50,8 @@ func main() {
 	t0 := time.Now()
 
 	rng := rand.New(rand.NewSource(0))
-	//imageField := NewImageField("/home/d/Dropbox/art/data/david.png")
-	imageField := NewImageField("/home/d/Dropbox/art/data/moses_statue.jpg")
+	imageField := NewImageField("/home/d/Dropbox/art/data/david.png")
+	//imageField := NewImageField("/home/d/Dropbox/art/data/moses_statue.jpg")
 	field :=
 		&TranslateField {
 			x: -float32(sourceWidth / 2.0),
@@ -66,7 +66,8 @@ func main() {
 
 	sierpinskiLayer := &SierpinskiArrow { dirty: true }
 
-	//sketch.AddColorLayer("background-magenta", rl.Magenta)
+	sketch.AddColorLayer("background-magenta", rl.Magenta)
+	//sketch.AddColorLayer("background-black", rl.Black)
 	sketch.AddLayer("field", &FieldLayer{field: field, loColor: rl.NewColor(0, 0, 0, 0), hiColor: rl.Yellow, dirty: true})
 	contourLayer := NewContourLayer(&sketch, rng, field)
 	sketch.AddLayer("contours", contourLayer)
diff --git a/sketch.go b/sketch.go
index c7b6f7c..a0bf68a 100644
--- a/sketch.go
+++ b/sketch.go
@@ -129,11 +129,11 @@ func (s *Sketch) Draw(ctx *RenderCtx) {
 
 	rl.BeginBlendMode(rl.BlendAlphaPremultiply)
 	rl.BeginTextureMode(s.composite)
-	rl.ClearBackground(rl.Black)
+	rl.ClearBackground(rl.Blank)
+	//rl.ClearBackground(rl.Black)
 	for _, instance := range s.layerToolsOrdered {
 		config := instance.config
 		if config.visible {
-			/*
 			var r uint8 = 0
 			if config.rVisible {
 				r = config.r
@@ -146,8 +146,7 @@ func (s *Sketch) Draw(ctx *RenderCtx) {
 			if config.bVisible {
 				b = config.b
 			}
-			*/
-			tint := rl.NewColor(config.a, config.a, config.a, 255)
+			tint := rl.NewColor(r, g, b, config.a)
 			rl.DrawTexturePro(instance.texture.Texture, src, dst, rl.Vector2{}, 0, tint)
 		}
 	}