--- old/src/java.desktop/share/native/libjavajpeg/imageioJPEG.c	2015-11-24 14:42:27.045644019 +0530
+++ new/src/java.desktop/share/native/libjavajpeg/imageioJPEG.c	2015-11-24 14:42:26.821644019 +0530
@@ -1610,6 +1610,7 @@
     int ret;
     int h_samp0, h_samp1, h_samp2;
     int v_samp0, v_samp1, v_samp2;
+    int cid0, cid1, cid2;
     jboolean retval = JNI_FALSE;
     imageIODataPtr data = (imageIODataPtr)jlong_to_ptr(ptr);
     j_decompress_ptr cinfo;
@@ -1711,17 +1712,15 @@
                 }
             } else if (!cinfo->saw_JFIF_marker && !IS_EXIF(cinfo)) {
                 /*
-                 * IJG assumes all unidentified 3-channels are YCbCr.
-                 * We assume that only if the second two channels are
-                 * subsampled (either horizontally or vertically).  If not,
-                 * we assume RGB.
-                 *
-                 * 4776576: Some digital cameras output YCbCr JPEG images
-                 * that do not contain a JFIF APP0 marker but are only
-                 * vertically subsampled (no horizontal subsampling).
-                 * We should only assume this is RGB data if the subsampling
-                 * factors for the second two channels are the same as the
-                 * first (check both horizontal and vertical factors).
+                 * In the absence of certain markers, IJG has interpreted
+                 * component id's of [1,2,3] as meaning YCbCr.We follow that
+                 * interpretation, which is additionally described in the Image
+                 * I/O JPEG metadata spec.If that condition is not met here the
+                 * next step will be to examine the subsampling factors, if
+                 * there is any difference in subsampling factors we also assume
+                 * YCbCr, only if both horizontal and vertical subsampling
+                 * is same we assume JPEG color space as RGB.
+                 * This is also described in the Image I/O JPEG metadata spec.
                  */
                 h_samp0 = cinfo->comp_info[0].h_samp_factor;
                 h_samp1 = cinfo->comp_info[1].h_samp_factor;
@@ -1731,8 +1730,13 @@
                 v_samp1 = cinfo->comp_info[1].v_samp_factor;
                 v_samp2 = cinfo->comp_info[2].v_samp_factor;
 
-                if ((h_samp1 == h_samp0) && (h_samp2 == h_samp0) &&
-                    (v_samp1 == v_samp0) && (v_samp2 == v_samp0))
+                cid0 = cinfo->comp_info[0].component_id;
+                cid1 = cinfo->comp_info[1].component_id;
+                cid2 = cinfo->comp_info[2].component_id;
+
+                if ((!(cid0 == 1 && cid1 == 2 && cid2 == 3)) &&
+                    ((h_samp1 == h_samp0) && (h_samp2 == h_samp0) &&
+                    (v_samp1 == v_samp0) && (v_samp2 == v_samp0)))
                 {
                     cinfo->jpeg_color_space = JCS_RGB;
                     /* output is already RGB, so it stays the same */
--- /dev/null	2015-11-24 13:52:36.031982000 +0530
+++ new/test/javax/imageio/plugins/jpeg/JpegImageColorSpaceTest.java	2015-11-24 14:42:27.489644019 +0530
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2015, 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     8041501
+ * @summary Test verifies if there is no JFIF & EXIF header
+ *          and sampling factor is same of JPEG image, then
+ *          imageIO should not override colorspace determined
+ *          in IJG library.
+ * @run     main JpegImageColorSpaceTest
+ */
+
+import java.awt.Color;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import javax.imageio.ImageIO;
+
+public class JpegImageColorSpaceTest {
+
+    public static void main(String args[]) throws Exception {
+
+        String fileName = "nomarkers.jpg";
+        String sep = System.getProperty("file.separator");
+        String dir = System.getProperty("test.src", ".");
+        String filePath = dir+sep+fileName;
+        System.out.println("Test file: " + filePath);
+        File imageFile = new File(filePath);
+
+        BufferedImage bufferedImage = ImageIO.read(imageFile);
+        int imageWidth = bufferedImage.getWidth();
+        int imageHeight = bufferedImage.getHeight();
+
+        for (int i = 0; i < imageWidth; i++) {
+            for(int j = 0; j < imageHeight; j++) {
+                /*
+                * Since image is white we check individual pixel values from
+                * BufferedImage to verify if ImageIO.read() is done with proper
+                * color space or not.
+                */
+                if (bufferedImage.getRGB(i, j) != Color.white.getRGB()) {
+                    // color space is not proper
+                    throw new RuntimeException("ColorSpace is not determined "
+                            + "properly by ImageIO");
+               }
+            }
+        }
+    }
+}
Binary files /dev/null and new/test/javax/imageio/plugins/jpeg/nomarkers.jpg differ