diff --git a/Assets/MeshUtility/Editor/AssetsPath.cs b/Assets/MeshUtility/Editor/AssetsPath.cs
new file mode 100644
index 000000000..96f575f20
--- /dev/null
+++ b/Assets/MeshUtility/Editor/AssetsPath.cs
@@ -0,0 +1,309 @@
+using System;
+using System.IO;
+using UnityEngine;
+using System.Collections.Generic;
+using UnityEditor;
+
+
+namespace MeshUtility
+{
+    /// <summary>
+    /// Application.dataPath を root とするファイルパスを扱う。
+    /// (Project/Assets)
+    /// </summary>
+    public struct AssetsPath
+    {
+        public string RelativePath
+        {
+            get;
+            private set;
+        }
+
+        public override string ToString()
+        {
+            return $"assets://{RelativePath}";
+        }
+
+        public string FileName
+        {
+            get { return Path.GetFileName(RelativePath); }
+        }
+
+        public string FileNameWithoutExtension
+        {
+            get
+            {
+                return Path.GetFileNameWithoutExtension(RelativePath);
+            }
+        }
+
+        public string Extension
+        {
+            get { return Path.GetExtension(RelativePath); }
+        }
+
+        public AssetsPath Parent
+        {
+            get
+            {
+                return new AssetsPath(Path.GetDirectoryName(RelativePath));
+            }
+        }
+
+        static readonly char[] EscapeChars = new char[]
+        {
+            '\\',
+            '/',
+            ':',
+            '*',
+            '?',
+            '"',
+            '<',
+            '>',
+            '|',
+        };
+
+        static string EscapeFilePath(string path)
+        {
+            foreach (var x in EscapeChars)
+            {
+                path = path.Replace(x, '+');
+            }
+            return path;
+        }
+
+        public AssetsPath Child(string name)
+        {
+            if (RelativePath == null)
+            {
+                throw new NotImplementedException();
+            }
+            else if (RelativePath == "")
+            {
+                return new AssetsPath(name);
+            }
+            else
+            {
+                return new AssetsPath(RelativePath + "/" + name);
+            }
+        }
+
+        public override int GetHashCode()
+        {
+            if (RelativePath == null)
+            {
+                return 0;
+            }
+            return RelativePath.GetHashCode();
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is AssetsPath)
+            {
+                var rhs = (AssetsPath)obj;
+                if (RelativePath == null && rhs.RelativePath == null)
+                {
+                    return true;
+                }
+                else if (RelativePath == null)
+                {
+                    return false;
+                }
+                else if (rhs.RelativePath == null)
+                {
+                    return false;
+                }
+                else
+                {
+                    return RelativePath == rhs.RelativePath;
+                }
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        AssetsPath(string value) : this()
+        {
+            RelativePath = value.Replace("\\", "/");
+        }
+
+        #region FullPath
+        static string s_basePath;
+        static string BaseFullPath
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(s_basePath))
+                {
+                    s_basePath = Path.GetFullPath(Application.dataPath).Replace("\\", "/");
+                }
+                return s_basePath;
+            }
+        }
+
+        public string FullPath
+        {
+            get
+            {
+                if (RelativePath == null)
+                {
+                    throw new NotImplementedException();
+                }
+                return Path.Combine(BaseFullPath, RelativePath).Replace("\\", "/");
+            }
+        }
+
+        public bool IsFileExists
+        {
+            get { return File.Exists(FullPath); }
+        }
+
+        public bool IsDirectoryExists
+        {
+            get { return Directory.Exists(FullPath); }
+        }
+
+        /// <summary>
+        ///
+        /// </summary>
+        /// <param name="fullPath">C:/path/to/file</param>
+        /// <returns></returns>
+        public static AssetsPath FromFullpath(string fullPath)
+        {
+            if (fullPath == null)
+            {
+                fullPath = "";
+            }
+            fullPath = fullPath.Replace("\\", "/");
+
+            if (fullPath == BaseFullPath)
+            {
+                return new AssetsPath
+                {
+                    RelativePath = ""
+                };
+            }
+            else if (fullPath.StartsWith(BaseFullPath + "/"))
+            {
+                return new AssetsPath(fullPath.Substring(BaseFullPath.Length + 1));
+            }
+            else
+            {
+                return default(AssetsPath);
+            }
+        }
+        #endregion
+
+        public IEnumerable<AssetsPath> TraverseDir()
+        {
+            if (IsDirectoryExists)
+            {
+                yield return this;
+
+                foreach (var child in ChildDirs)
+                {
+                    foreach (var x in child.TraverseDir())
+                    {
+                        yield return x;
+                    }
+                }
+            }
+        }
+
+        public IEnumerable<AssetsPath> ChildDirs
+        {
+            get
+            {
+                foreach (var x in Directory.GetDirectories(FullPath))
+                {
+                    yield return AssetsPath.FromFullpath(x);
+                }
+            }
+        }
+
+        public IEnumerable<AssetsPath> ChildFiles
+        {
+            get
+            {
+                foreach (var x in Directory.GetFiles(FullPath))
+                {
+                    yield return AssetsPath.FromFullpath(x);
+                }
+            }
+        }
+
+#if UNITY_EDITOR
+        string UnityPath => $"Assets/{RelativePath}";
+
+        public T GetImporter<T>() where T : AssetImporter
+        {
+            return AssetImporter.GetAtPath(UnityPath) as T;
+        }
+
+        public static AssetsPath FromAsset(UnityEngine.Object asset)
+        {
+            // skip Assets/
+            return new AssetsPath(AssetDatabase.GetAssetPath(asset).Substring(7));
+        }
+
+        public void ImportAsset()
+        {
+            AssetDatabase.ImportAsset(UnityPath);
+        }
+
+        public void EnsureFolder()
+        {
+            if (RelativePath == null)
+            {
+                throw new NotImplementedException();
+            }
+
+            if (!string.IsNullOrEmpty(Parent.RelativePath))
+            {
+                Parent.EnsureFolder();
+            }
+
+            if (!IsDirectoryExists)
+            {
+                var parent = Parent;
+                // ensure parent
+                parent.ImportAsset();
+                // create
+                AssetDatabase.CreateFolder(
+                    parent.UnityPath,
+                    Path.GetFileName(RelativePath)
+                    );
+                ImportAsset();
+            }
+        }
+
+        public UnityEngine.Object[] GetSubAssets()
+        {
+            return AssetDatabase.LoadAllAssetsAtPath(UnityPath);
+        }
+
+        public void CreateAsset(UnityEngine.Object o)
+        {
+            AssetDatabase.CreateAsset(o, UnityPath);
+        }
+
+        public void AddObjectToAsset(UnityEngine.Object o)
+        {
+            AssetDatabase.AddObjectToAsset(o, UnityPath);
+        }
+
+        public T LoadAsset<T>() where T : UnityEngine.Object
+        {
+            return AssetDatabase.LoadAssetAtPath<T>(UnityPath);
+        }
+
+        public AssetsPath GenerateUniqueAssetPath()
+        {
+            return new AssetsPath(AssetDatabase.GenerateUniqueAssetPath(UnityPath));
+        }
+#endif
+    }
+}
diff --git a/Assets/MeshUtility/Editor/AssetsPath.cs.meta b/Assets/MeshUtility/Editor/AssetsPath.cs.meta
new file mode 100644
index 000000000..4918b11e4
--- /dev/null
+++ b/Assets/MeshUtility/Editor/AssetsPath.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: da24ccbbed21eb94d902d42337df3699
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/MeshUtility/Editor/TextureSaver.cs b/Assets/MeshUtility/Editor/TextureSaver.cs
index cffbd39f0..e2425f1d6 100644
--- a/Assets/MeshUtility/Editor/TextureSaver.cs
+++ b/Assets/MeshUtility/Editor/TextureSaver.cs
@@ -7,6 +7,7 @@ namespace MeshUtility
     public static class EditorChangeTextureType
     {
         [MenuItem("Assets/SaveAsPng", true)]
+        [MenuItem("Assets/SaveAsPngLinear", true)]
         static bool IsTextureAsset()
         {
             return Selection.activeObject is Texture2D;
@@ -14,32 +15,52 @@ namespace MeshUtility
 
         [MenuItem("Assets/SaveAsPng")]
         static void SaveAsPng()
+        {
+            SaveAsPng(true);
+        }
+
+        [MenuItem("Assets/SaveAsPngLinear")]
+        static void SaveAsPngLinear()
+        {
+            SaveAsPng(false);
+        }
+
+        static void SaveAsPng(bool sRGB)
         {
             var texture = Selection.activeObject as Texture2D;
-            var path = SaveDialog(texture.name);
+            var path = SaveDialog(AssetsPath.FromAsset(texture));
             if (string.IsNullOrEmpty(path))
             {
                 return;
             }
 
             File.WriteAllBytes(path, texture.EncodeToPNG());
-            Debug.Log($"save: ${path}");
+            Debug.Log($"save: {path}");
+
+            var assetsPath = AssetsPath.FromFullpath(path);
+
+            EditorApplication.delayCall += () =>
+            {
+                assetsPath.ImportAsset();
+                var importer = assetsPath.GetImporter<TextureImporter>();
+                if (importer == null)
+                {
+                    Debug.LogWarningFormat("fail to get TextureImporter: {0}", assetsPath);
+                }
+                importer.sRGBTexture = sRGB;
+                importer.SaveAndReimport();
+                Debug.Log($"sRGB: {sRGB}");
+            };
         }
 
         private static string m_lastExportDir;
-        static string SaveDialog(string name)
+        static string SaveDialog(AssetsPath assetsPath)
         {
-            string directory;
-            if (string.IsNullOrEmpty(m_lastExportDir))
-                directory = Directory.GetParent(Application.dataPath).ToString();
-            else
-                directory = m_lastExportDir;
-
             // save dialog
             var path = EditorUtility.SaveFilePanel(
                     "Save png",
-                    directory,
-                    $"{name}.png",
+                    assetsPath.Parent.FullPath,
+                    $"{assetsPath.FileNameWithoutExtension}.png",
                     "png");
             if (!string.IsNullOrEmpty(path))
             {