diff --git a/Data_science/MachineLearning/DeepLearning/CeNiN/Layers/Input.vb b/Data_science/MachineLearning/DeepLearning/CeNiN/Layers/Input.vb
index 4ae918448a..fa1abcb373 100644
--- a/Data_science/MachineLearning/DeepLearning/CeNiN/Layers/Input.vb
+++ b/Data_science/MachineLearning/DeepLearning/CeNiN/Layers/Input.vb
@@ -62,6 +62,8 @@ Imports System.Runtime.CompilerServices
 Imports System.Runtime.InteropServices
 Imports Microsoft.VisualBasic.MachineLearning.Convolutional.ImageProcessor
 Imports System.Drawing
+Imports Microsoft.VisualBasic.Imaging.BitmapImage
+
 
 #If NET48 Then
 Imports Pen = System.Drawing.Pen
@@ -142,7 +144,7 @@ Namespace Convolutional
         ''' <returns></returns>
         Public Overrides Function feedNext() As Layer
             Dim fullImage As New Rectangle(0, 0, inputSize(1), inputSize(0))
-            Dim bmpData As BitmapData = _resizedInputBmp.LockBits(fullImage, ImageLockMode.ReadOnly, _resizedInputBmp.PixelFormat)
+            Dim bmpData As BitmapBuffer = BitmapBuffer.FromBitmap(_resizedInputBmp)
             Dim stride As Integer = bmpData.Stride
             Dim emptyBytesCount As Integer = stride - bmpData.Width * 3
             Dim rowLengthWithoutEB As Integer = stride - emptyBytesCount
@@ -178,7 +180,6 @@ Namespace Convolutional
                 End If
             End While
 
-            Call _resizedInputBmp.UnlockBits(bmpData)
             Call _resizedInputBmp.Dispose()
 
             Return Me
diff --git a/Data_science/MachineLearning/MLDataStorage/MNIST.vb b/Data_science/MachineLearning/MLDataStorage/MNIST.vb
index ff9b8273fc..76067d629b 100644
--- a/Data_science/MachineLearning/MLDataStorage/MNIST.vb
+++ b/Data_science/MachineLearning/MLDataStorage/MNIST.vb
@@ -65,6 +65,8 @@ Imports System.Runtime.CompilerServices
 Imports System.Runtime.InteropServices
 Imports Microsoft.VisualBasic.ComponentModel.DataSourceModel
 Imports std = System.Math
+Imports Microsoft.VisualBasic.Imaging.BitmapImage
+
 
 #If NET48 Then
 Imports Pen = System.Drawing.Pen
@@ -168,7 +170,7 @@ Public Class MNIST : Implements IDisposable
 
     Public Function ConvertImage(raw As NamedCollection(Of Byte)) As NamedValue(Of Image)
         Dim image As Bitmap = New Bitmap(columns, rows)
-        Dim data = image.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb)
+        Dim data As BitmapBuffer = BitmapBuffer.FromBitmap(image)
         Dim ptr As IntPtr = data.Scan0
         Dim bytes = std.Abs(data.Stride) * image.Height
         Dim rgbValues = New Byte(bytes - 1) {}
@@ -184,8 +186,7 @@ Public Class MNIST : Implements IDisposable
         Next
 
         Marshal.Copy(rgbValues, 0, ptr, bytes)
-
-        image.UnlockBits(data)
+        data.Dispose()
 
         Return New NamedValue(Of Image) With {
             .Name = raw.Last,
diff --git a/Data_science/Visualization/Visualization/Embedding/EmbeddingRender.vb b/Data_science/Visualization/Visualization/Embedding/EmbeddingRender.vb
index 24b0eec605..fb02d4eb54 100644
--- a/Data_science/Visualization/Visualization/Embedding/EmbeddingRender.vb
+++ b/Data_science/Visualization/Visualization/Embedding/EmbeddingRender.vb
@@ -56,10 +56,17 @@ Imports System.Drawing
 Imports Microsoft.VisualBasic.Data.ChartPlots.Graphic
 Imports Microsoft.VisualBasic.Data.ChartPlots.Graphic.Canvas
 Imports Microsoft.VisualBasic.DataMining.ComponentModel
-Imports Microsoft.VisualBasic.DataMining.UMAP
 Imports Microsoft.VisualBasic.Imaging.Drawing2D.Colors
 Imports Microsoft.VisualBasic.Linq
 
+#If NET48 Then
+Imports SolidBrush = System.Drawing.SolidBrush
+Imports Brushes = System.Drawing.Brushes
+#Else
+Imports SolidBrush = Microsoft.VisualBasic.Imaging.SolidBrush
+Imports Brushes = Microsoft.VisualBasic.Imaging.Brushes
+#End If
+
 Public MustInherit Class EmbeddingRender : Inherits Plot
 
     Protected ReadOnly labels As String()
diff --git a/Microsoft.VisualBasic.Core/src/Drawing/GDI+/GraphicsExtensions.vb b/Microsoft.VisualBasic.Core/src/Drawing/GDI+/GraphicsExtensions.vb
index 44040a70fb..a64fb8eb41 100644
--- a/Microsoft.VisualBasic.Core/src/Drawing/GDI+/GraphicsExtensions.vb
+++ b/Microsoft.VisualBasic.Core/src/Drawing/GDI+/GraphicsExtensions.vb
@@ -67,6 +67,7 @@ Imports System.Runtime.CompilerServices
 Imports System.Runtime.InteropServices
 Imports Microsoft.VisualBasic.CommandLine.Reflection
 Imports Microsoft.VisualBasic.ComponentModel.Algorithm.base
+Imports Microsoft.VisualBasic.Imaging.BitmapImage
 Imports Microsoft.VisualBasic.Language
 Imports Microsoft.VisualBasic.Linq
 Imports Microsoft.VisualBasic.Net.Http
@@ -407,6 +408,36 @@ Namespace Imaging
             End With
         End Function
 
+        ''' <summary>
+        ''' Color replace using memory pointer
+        ''' </summary>
+        ''' <param name="image"></param>
+        ''' <param name="subject"></param>
+        ''' <param name="replaceAs"></param>
+        ''' <returns></returns>
+        <Extension>
+        Public Function ColorReplace(image As Bitmap, subject As Color, replaceAs As Color, Optional tolerance% = 3) As Bitmap
+            Using bitmap As BitmapBuffer = BitmapBuffer.FromBitmap(image)
+                Dim byts As BitmapBuffer = bitmap
+
+                For x As Integer = 0 To byts.Width - 1
+                    For y As Integer = 0 To byts.Height - 1
+                        If GDIColors.Equals(byts.GetPixel(x, y), subject, tolerance) Then
+                            Call byts.SetPixel(x, y, replaceAs)
+                        End If
+                    Next
+                Next
+            End Using
+
+            Return image
+        End Function
+
+        <MethodImpl(MethodImplOptions.AggressiveInlining)>
+        <Extension>
+        Public Function ColorReplace(image As Image, subject As Color, replaceAs As Color, Optional tolerance% = 3) As Bitmap
+            Return New Bitmap(image).ColorReplace(subject, replaceAs, tolerance)
+        End Function
+
         ''' <summary>
         ''' Adding a frame box to the target image source.(为图像添加边框)
         ''' </summary>
diff --git a/gr/Drawing-net4.8/Utils.vb b/gr/Drawing-net4.8/Utils.vb
index d82eb40587..d9b675ff3c 100644
--- a/gr/Drawing-net4.8/Utils.vb
+++ b/gr/Drawing-net4.8/Utils.vb
@@ -275,35 +275,5 @@ Namespace Imaging.BitmapImage
                 Return res
             End If
         End Function
-
-        ''' <summary>
-        ''' Color replace using memory pointer
-        ''' </summary>
-        ''' <param name="image"></param>
-        ''' <param name="subject"></param>
-        ''' <param name="replaceAs"></param>
-        ''' <returns></returns>
-        <Extension>
-        Public Function ColorReplace(image As Bitmap, subject As Color, replaceAs As Color, Optional tolerance% = 3) As Bitmap
-            Using bitmap As BitmapBuffer = BitmapBuffer.FromBitmap(image)
-                Dim byts As BitmapBuffer = bitmap
-
-                For x As Integer = 0 To byts.Width - 1
-                    For y As Integer = 0 To byts.Height - 1
-                        If GDIColors.Equals(byts.GetPixel(x, y), subject, tolerance) Then
-                            Call byts.SetPixel(x, y, replaceAs)
-                        End If
-                    Next
-                Next
-            End Using
-
-            Return image
-        End Function
-
-        <MethodImpl(MethodImplOptions.AggressiveInlining)>
-        <Extension>
-        Public Function ColorReplace(image As Image, subject As Color, replaceAs As Color, Optional tolerance% = 3) As Bitmap
-            Return New Bitmap(image).ColorReplace(subject, replaceAs, tolerance)
-        End Function
     End Module
 End Namespace