--- /dev/null	2017-05-19 18:25:59.000000000 -0700
+++ new/test/javax/imageio/plugins/gif/TransparencyTest.java	2017-05-19 18:25:58.000000000 -0700
@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) 2005, 2017, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 4339415
+ * @summary Tests that GIF writer plugin is able to write images with BITMASK
+ *          transparency
+ */
+
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.awt.image.IndexColorModel;
+import java.awt.image.WritableRaster;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriter;
+
+public class TransparencyTest {
+
+    protected static final String fname = "ttest.gif";
+    protected BufferedImage src;
+    protected BufferedImage dst;
+
+    public static void main(String[] args) {
+        System.out.println("Test indexed image...");
+        IndexColorModel icm = createIndexedBitmaskColorModel();
+        BufferedImage img = createIndexedImage(200, 200, icm);
+        TransparencyTest t = new TransparencyTest(img);
+
+        try {
+            t.doTest();
+        } catch (Exception e) {
+            throw new RuntimeException("Test failed!", e);
+        }
+        System.out.println("Test passed.");
+    }
+
+    protected TransparencyTest(BufferedImage src) {
+        this.src = src;
+    }
+
+    protected void doTest() throws IOException {
+        int w = src.getWidth();
+        int h = src.getHeight();
+
+        System.out.println("Write image...");
+        try {
+            ImageWriter writer =
+                ImageIO.getImageWritersByFormatName("GIF").next();
+            writer.setOutput(ImageIO.createImageOutputStream(new File(fname)));
+            writer.write(src);
+        } catch (Exception e) {
+            throw new RuntimeException("Test failed.", e);
+        }
+        System.out.println("Read image....");
+        dst = ImageIO.read(new File(fname));
+
+        BufferedImage tmp = new BufferedImage(w, 2 * h,
+                                              BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g = tmp.createGraphics();
+        g.setColor(Color.pink);
+        g.fillRect(0, 0, tmp.getWidth(), tmp.getHeight());
+
+        g.drawImage(src, 0, 0, null);
+        g.drawImage(dst, 0, h, null);
+
+        int width = w / 8;
+        int x = 5 * width + width / 2;
+        for (int y = 0; y < h; y++) {
+            int argb = tmp.getRGB(x, y);
+            if (Color.pink.getRGB() != argb) {
+                throw new RuntimeException("Bad color at " + x + "," + y +
+                                           " - " + Integer.toHexString(argb));
+            }
+        }
+    }
+
+    protected static BufferedImage createIndexedImage(int w, int h,
+                                                      IndexColorModel icm)
+    {
+        BufferedImage img = new BufferedImage(w, h,
+                                              BufferedImage.TYPE_BYTE_INDEXED,
+                                              icm);
+
+        int mapSize = icm.getMapSize();
+        int width = w / mapSize;
+
+        WritableRaster wr = img.getRaster();
+        for (int i = 0; i < mapSize; i++) {
+            for (int y = 0; y < h; y++) {
+                for (int x = 0; x < width; x++) {
+                    wr.setSample(i * width + x, y, 0, i);
+                }
+            }
+        }
+        return img;
+    }
+
+    protected  static IndexColorModel createIndexedBitmaskColorModel() {
+        int paletteSize = 8;
+        byte[] red = new byte[paletteSize];
+        byte[] green = new byte[paletteSize];
+        byte[] blue = new byte[paletteSize];
+
+        red[0] = (byte)0xff; green[0] = (byte)0x00; blue[0] = (byte)0x00;
+        red[1] = (byte)0x00; green[1] = (byte)0xff; blue[1] = (byte)0x00;
+        red[2] = (byte)0x00; green[2] = (byte)0x00; blue[2] = (byte)0xff;
+        red[3] = (byte)0xff; green[3] = (byte)0xff; blue[3] = (byte)0xff;
+        red[4] = (byte)0x00; green[4] = (byte)0x00; blue[4] = (byte)0x00;
+        red[5] = (byte)0x80; green[5] = (byte)0x80; blue[5] = (byte)0x80;
+        red[6] = (byte)0xff; green[6] = (byte)0xff; blue[6] = (byte)0x00;
+        red[7] = (byte)0x00; green[7] = (byte)0xff; blue[7] = (byte)0xff;
+
+        int numBits = 3;
+
+        IndexColorModel icm = new IndexColorModel(numBits, paletteSize,
+                                                  red, green, blue, 5);
+
+        return icm;
+    }
+}