diff --git a/ArcFormats/ImageDDS.cs b/ArcFormats/ImageDDS.cs
index 71bb0627..7431774c 100644
--- a/ArcFormats/ImageDDS.cs
+++ b/ArcFormats/ImageDDS.cs
@@ -2,7 +2,7 @@
 //! \date       Thu Jul 23 18:12:05 2015
 //! \brief      Direct Draw Surface image format.
 //
-// Copyright (C) 2015 by morkt
+// Copyright (C) 2015-2016 by morkt
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to
@@ -23,8 +23,10 @@
 // IN THE SOFTWARE.
 //
 
+using System;
 using System.ComponentModel.Composition;
 using System.IO;
+using System.Text;
 using System.Windows.Media;
 using GameRes.Utility;
 
@@ -32,8 +34,20 @@ namespace GameRes.Formats.Microsoft
 {
     internal class DdsMetaData : ImageMetaData
     {
-        public int  DataOffset;
-        public uint PixelFlags;
+        public int      DataOffset;
+        public DdsPF    PixelFlags;
+        public string   FourCC;
+    }
+
+    [Flags]
+    internal enum DdsPF : uint
+    {
+        AlphaPixels     = 1,
+        Alpha           = 2,
+        FourCC          = 4,
+        Rgb             = 0x40,
+        Yuv             = 0x200,
+        Luminance       = 0x20000,
     }
 
     [Export(typeof(ImageFormat))]
@@ -51,30 +65,38 @@ namespace GameRes.Formats.Microsoft
             int dwSize = LittleEndian.ToInt32 (header, 4);
             if (dwSize < 0x7C)
                 return null;
-            uint bitflag = LittleEndian.ToUInt32 (header, 0x50);
+            var bitflags = (DdsPF)LittleEndian.ToUInt32 (header, 0x50);
+            string four_cc = null;
+            if (bitflags.HasFlag (DdsPF.FourCC))
+                four_cc = Binary.GetCString (header, 0x54, 4, Encoding.ASCII);
             return new DdsMetaData
             {
                 Width  = LittleEndian.ToUInt32 (header, 0x10),
                 Height = LittleEndian.ToUInt32 (header, 0xC),
                 BPP    = LittleEndian.ToInt32 (header, 0x58),
-                PixelFlags = LittleEndian.ToUInt32 (header, 0x50),
+                PixelFlags = bitflags,
+                FourCC = four_cc,
                 DataOffset = 4 + dwSize,
             };
         }
 
         public override ImageData Read (Stream stream, ImageMetaData info)
         {
-            var meta = info as DdsMetaData;
-            if (null == meta)
-                throw new System.ArgumentException ("DdsFormat.Read should be supplied with DdsMetaData", "info");
-            stream.Position = meta.DataOffset;
+            var meta = (DdsMetaData)info;
+            if (meta.PixelFlags.HasFlag (DdsPF.Yuv | DdsPF.Luminance))
+                throw new NotSupportedException ("Not supported DDS texture color format");
+            if (!string.IsNullOrEmpty (meta.FourCC))
+                throw new NotImplementedException ("Compressed DDS textures not implemented");
             PixelFormat format;
             if (24 == info.BPP)
                 format = PixelFormats.Bgr24;
-            else if (1 == (meta.PixelFlags & 1))
+            else if (16 == info.BPP)
+                throw new NotImplementedException ("16bpp DDS textures not implemented");
+            else if (meta.PixelFlags.HasFlag (DdsPF.AlphaPixels))
                 format = PixelFormats.Bgra32;
             else
                 format = PixelFormats.Bgr32;
+            stream.Position = meta.DataOffset;
             var pixels = new byte[info.Width*info.Height*((format.BitsPerPixel+7)/8)];
             if (pixels.Length != stream.Read (pixels, 0, pixels.Length))
                 throw new InvalidFormatException ("Unexpected end of file");