--- old/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGMetadata.java	2018-04-18 14:57:17.631886000 +0530
+++ new/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGMetadata.java	2018-04-18 14:57:17.119886000 +0530
@@ -1882,6 +1882,7 @@
                             bKGD_colorType = PNGImageReader.PNG_COLOR_GRAY;
                             bKGD_gray = red;
                         } else {
+                            bKGD_colorType = PNGImageReader.PNG_COLOR_RGB;
                             bKGD_red = red;
                             bKGD_green = green;
                             bKGD_blue = blue;