--- old/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGMetadata.java	2018-04-10 11:26:56.724043831 +0530
+++ new/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGMetadata.java	2018-04-10 11:26:56.435899841 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2259,6 +2259,12 @@
         return retVal;
     }
 
+    boolean hasTransparentColor() {
+        return tRNS_present &&
+               (tRNS_colorType == PNGImageReader.PNG_COLOR_RGB ||
+               tRNS_colorType == PNGImageReader.PNG_COLOR_GRAY);
+    }
+
     // Reset all instance variables to their initial state
     public void reset() {
         IHDR_present = false;
@@ -2294,3 +2300,4 @@
         unknownChunkData = new ArrayList<byte[]>();
     }
 }
+