diff --git a/Legacy/Speed/ImageDAT.cs b/Legacy/Speed/ImageDAT.cs
new file mode 100644
index 00000000..f5b3848d
--- /dev/null
+++ b/Legacy/Speed/ImageDAT.cs
@@ -0,0 +1,179 @@
+//! \file       ImageDAT.cs
+//! \date       2018 Jul 07
+//! \brief      Studio Jikkenshitsu compressed image.
+//
+// Copyright (C) 2018 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
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace GameRes.Formats.Speed
+{
+    internal class SpMetaData : ImageMetaData
+    {
+        public int  Flags;
+        public int  Colors;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class SpDatFormat : ImageFormat
+    {
+        public override string         Tag { get { return "DAT/SPEED"; } }
+        public override string Description { get { return "Studio Jikkenshitsu image format"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public SpDatFormat ()
+        {
+            Extensions = new string[0];
+            Signatures = new uint[] { 0x010003, 0x010007, 0 };
+        }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (0x22);
+            if (header.ToInt32 (4) != 0)
+                return null;
+            int flags = header.ToUInt16 (0);
+            if ((flags & ~7) != 0)
+                return null;
+            return new SpMetaData {
+                Width = header.ToUInt16 (0x16),
+                Height = header.ToUInt16 (0x18),
+                BPP = 8,
+                Flags = flags,
+                Colors = header.ToUInt16 (0x1E),
+            };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var reader = new SpReader (file, (SpMetaData)info);
+            var pixels = reader.Unpack();
+            return ImageData.CreateFlipped (info, reader.Format, reader.Palette, pixels, reader.Stride);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("SpDatFormat.Write not implemented");
+        }
+    }
+
+    internal class SpReader
+    {
+        IBinaryStream   m_input;
+        SpMetaData      m_info;
+        byte[]          m_output;
+        int             m_stride;
+
+        public PixelFormat    Format { get; private set; }
+        public int            Stride { get { return m_stride; } }
+        public BitmapPalette Palette { get; private set; }
+
+        public SpReader (IBinaryStream input, SpMetaData info)
+        {
+            m_input = input;
+            m_info = info;
+            m_output = new byte[info.Width * info.Height];
+            m_stride = (int)info.Width;
+        }
+
+        public byte[] Unpack ()
+        {
+            m_input.Position = 0x22;
+            int packed_size = m_input.ReadInt32();
+            Palette = ImageFormat.ReadPalette (m_input.AsStream, m_info.Colors);
+            UnpackRle (packed_size, m_output);
+            if (packed_size != 0 && (m_info.Flags & 4) != 0)
+            {
+                var alpha = new byte[m_output.Length >> 1];
+                packed_size = m_input.ReadInt32();
+                UnpackRle (packed_size, alpha);
+//                Format = PixelFormats.Gray4;
+//                m_stride >>= 1;
+//                return alpha;
+                return ConvertToRgbA (alpha);
+            }
+            Format = PixelFormats.Indexed8;
+            return m_output;
+        }
+
+        byte[] ConvertToRgbA (byte[] alpha)
+        {
+            m_stride = (int)m_info.Width * 4;
+            var pixels = new byte[m_stride * (int)m_info.Height];
+            var colors = Palette.Colors;
+            int dst = 0;
+            for (int src = 0; src < m_output.Length; ++src)
+            {
+                var color = colors[m_output[src]];
+                int a = ((alpha[src >> 1] >> ((~src & 1) << 2)) & 0xF) * 0x11;
+                pixels[dst++] = color.B;
+                pixels[dst++] = color.G;
+                pixels[dst++] = color.R;
+                pixels[dst++] = (byte)a;
+            }
+            Format = PixelFormats.Bgra32;
+            return pixels;
+        }
+
+        void UnpackRle (int packed_size, byte[] output)
+        {
+            if (0 == packed_size)
+            {
+                m_input.Read (output, 0, output.Length);
+                return;
+            }
+            int dst = 0;
+            int state = 0;
+            byte pixel = 0;
+            for (int i = 0; i < packed_size; ++i)
+            {
+                int rep = m_input.ReadByte();
+                if (-1 == rep)
+                    break;
+                if (0 == state)
+                {
+                    state = 1;
+                    output[dst++] = (byte)rep;
+                }
+                else if (1 == state)
+                {
+                    if (output[dst - 1] == rep)
+                    {
+                        pixel = (byte)rep;
+                        state = 2;
+                    }
+                    output[dst++] = (byte)rep;
+                }
+                else
+                {
+                    int count = rep - 2;
+                    for (int j = 0; j < count; ++j)
+                        output[dst++] = pixel;
+                    state = 0;
+                }
+            }
+        }
+    }
+}