diff --git a/CHANGELOG.md b/CHANGELOG.md
index 961b5c9..4128c16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Add `SystemDpi` to store the system `dpi` value.
 - Update `GetBitmapFrameByWidthAndDpi` to round `dpi` frame value.
 - Update `Width` to `Math.Round` to improve order by `Width`.
+- Update `GetBitmapFrameByWidthAndDpi` to public.
 ### Example
 - Add `Cube-Grey-Light.tiff` and `Cube-Grey-Dark.tiff` in `AppTheme`.
 ### Tests
diff --git a/Directory.Build.props b/Directory.Build.props
index 37ccfc5..776e1de 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,5 +1,5 @@
 <Project>
 	<PropertyGroup>
-		<Version>0.7.1-alpha.3</Version>
+		<Version>0.7.1-alpha.4</Version>
 	</PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/ricaun.Revit.UI/BitmapExtension.cs b/ricaun.Revit.UI/BitmapExtension.cs
index d5d88cb..757497c 100644
--- a/ricaun.Revit.UI/BitmapExtension.cs
+++ b/ricaun.Revit.UI/BitmapExtension.cs
@@ -109,16 +109,20 @@ internal static double GetSystemDpi()
             catch { }
             return systemDpi;
         }
-        internal readonly static double SystemDpi = GetSystemDpi();
+
+        /// <summary>
+        /// System Dpi
+        /// </summary>
+        public readonly static double SystemDpi = GetSystemDpi();
 
         /// <summary>
         /// Get the bitmap frame from the <paramref name="bitmapDecoder"/> based on the DPI and width.
         /// </summary>
         /// <param name="bitmapDecoder">The bitmap decoder.</param>
         /// <param name="width">The desired width of the bitmap frame. When set to zero, the smallest width frame is returned.</param>
-        /// <param name="dpi">The optimal dpi for the frame.</param>
+        /// <param name="dpi">The optimal dpi for the frame. When set to zero, <see cref="SystemDpi"/> is used.</param>
         /// <returns>The bitmap frame with the specified width or the smallest width frame.</returns>
-        internal static BitmapFrame GetBitmapFrameByWidthAndDpi(this BitmapDecoder bitmapDecoder, int width = 0, int dpi = 0)
+        public static BitmapFrame GetBitmapFrameByWidthAndDpi(this BitmapDecoder bitmapDecoder, int width, int dpi = 0)
         {
             double systemDpi = dpi > 0 ? dpi : SystemDpi;