diff --git a/Assets/FlashTools/Scripts/Internal/Editor/Postprocessors/SwfAssetPostprocessor.cs b/Assets/FlashTools/Scripts/Internal/Editor/Postprocessors/SwfAssetPostprocessor.cs
index 13a47e9..be73c6f 100644
--- a/Assets/FlashTools/Scripts/Internal/Editor/Postprocessors/SwfAssetPostprocessor.cs
+++ b/Assets/FlashTools/Scripts/Internal/Editor/Postprocessors/SwfAssetPostprocessor.cs
@@ -208,7 +208,7 @@ namespace FlashTools.Internal {
 				var bitmap = inst != null
 					? FindBitmapFromAssetData(asset.Data, inst.Bitmap)
 					: null;
-				if ( bitmap != null ) {
+				if ( bitmap != null && IsVisibleInstance(inst) ) {
 					var width  = bitmap.RealSize.x / 20.0f;
 					var height = bitmap.RealSize.y / 20.0f;
 
@@ -335,6 +335,11 @@ namespace FlashTools.Internal {
 			return null;
 		}
 
+		static bool IsVisibleInstance(SwfInstanceData inst) {
+			var result_color = inst.ColorTrans.ApplyToColor(Color.white);
+			return result_color.a >= 0.01f;
+		}
+
 		// ---------------------------------------------------------------------
 		//
 		// ConfigureAssetClips
diff --git a/Assets/FlashTools/Scripts/SwfAsset.cs b/Assets/FlashTools/Scripts/SwfAsset.cs
index d466eaf..d667e11 100644
--- a/Assets/FlashTools/Scripts/SwfAsset.cs
+++ b/Assets/FlashTools/Scripts/SwfAsset.cs
@@ -42,6 +42,14 @@ namespace FlashTools {
 		public Vector4 Mul;
 		public Vector4 Add;
 
+		public Color ApplyToColor(Color color) {
+			return new Color(
+				Mathf.Clamp01(color.r * Mul.x + Add.x),
+				Mathf.Clamp01(color.g * Mul.y + Add.y),
+				Mathf.Clamp01(color.b * Mul.z + Add.z),
+				Mathf.Clamp01(color.a * Mul.w + Add.w));
+		}
+
 		public static SwfColorTransData identity {
 			get {
 				return new SwfColorTransData{