VB.Net Tutorial/2D Graphics/ImageAttributes

Change Image Attributes

Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Drawing.Imaging
public class ChangeImageAttributes
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents SaveImgBtn As System.Windows.Forms.Button
    Friend WithEvents textBox2 As System.Windows.Forms.TextBox
    Friend WithEvents label3 As System.Windows.Forms.Label
    Friend WithEvents textBox1 As System.Windows.Forms.TextBox
    Friend WithEvents label2 As System.Windows.Forms.Label
    Friend WithEvents label1 As System.Windows.Forms.Label
    Friend WithEvents trackBar1 As System.Windows.Forms.TrackBar
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.SaveImgBtn = New System.Windows.Forms.Button
        Me.textBox2 = New System.Windows.Forms.TextBox
        Me.label3 = New System.Windows.Forms.Label
        Me.textBox1 = New System.Windows.Forms.TextBox
        Me.label2 = New System.Windows.Forms.Label
        Me.label1 = New System.Windows.Forms.Label
        Me.trackBar1 = New System.Windows.Forms.TrackBar
        CType(Me.trackBar1, System.ruponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        "
        "SaveImgBtn
        "
        Me.SaveImgBtn.Location = New System.Drawing.Point(392, 248)
        Me.SaveImgBtn.Name = "SaveImgBtn"
        Me.SaveImgBtn.Size = New System.Drawing.Size(120, 32)
        Me.SaveImgBtn.TabIndex = 13
        Me.SaveImgBtn.Text = "Save Image"
        "
        "textBox2
        "
        Me.textBox2.Location = New System.Drawing.Point(456, 200)
        Me.textBox2.Name = "textBox2"
        Me.textBox2.Size = New System.Drawing.Size(64, 20)
        Me.textBox2.TabIndex = 12
        Me.textBox2.Text = ""
        "
        "label3
        "
        Me.label3.Location = New System.Drawing.Point(360, 200)
        Me.label3.Name = "label3"
        Me.label3.Size = New System.Drawing.Size(88, 24)
        Me.label3.TabIndex = 11
        Me.label3.Text = "New Height:"
        "
        "textBox1
        "
        Me.textBox1.Location = New System.Drawing.Point(456, 168)
        Me.textBox1.Name = "textBox1"
        Me.textBox1.Size = New System.Drawing.Size(64, 20)
        Me.textBox1.TabIndex = 10
        Me.textBox1.Text = ""
        "
        "label2
        "
        Me.label2.Location = New System.Drawing.Point(360, 168)
        Me.label2.Name = "label2"
        Me.label2.Size = New System.Drawing.Size(88, 24)
        Me.label2.TabIndex = 9
        Me.label2.Text = "New Width:"
        "
        "label1
        "
        Me.label1.Location = New System.Drawing.Point(360, 48)
        Me.label1.Name = "label1"
        Me.label1.Size = New System.Drawing.Size(96, 24)
        Me.label1.TabIndex = 8
        Me.label1.Text = "Transparency"
        "
        "trackBar1
        "
        Me.trackBar1.LargeChange = 1
        Me.trackBar1.Location = New System.Drawing.Point(352, 88)
        Me.trackBar1.Name = "trackBar1"
        Me.trackBar1.Size = New System.Drawing.Size(104, 45)
        Me.trackBar1.TabIndex = 7
        Me.trackBar1.Value = 1
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(520, 341)
        Me.Controls.Add(Me.textBox2)
        Me.Controls.Add(Me.label3)
        Me.Controls.Add(Me.textBox1)
        Me.Controls.Add(Me.label2)
        Me.Controls.Add(Me.label1)
        Me.Controls.Add(Me.trackBar1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        CType(Me.trackBar1, System.ruponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)
    End Sub
#End Region
    Dim tpVal as Single = 10
    Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim curImage As Image = Image.FromFile("yourfile.jpg")
        e.Graphics.DrawImage(curImage, AutoScrollPosition.X, AutoScrollPosition.Y, curImage.Width, curImage.Height)
        Dim ptsArray As Single()() = {New Single() {1, 0, 0, 0, 0}, New Single() {0, 1, 0, 0, 0}, New Single() {0, 0, 1, 0, 0}, New Single() {0, 0, 0, tpVal, 0}, New Single() {0, 0, 0, 0, 1}}
        Dim clrMatrix As New ColorMatrix(ptsArray)
        Dim imgAttributes As New ImageAttributes
        imgAttributes.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap)
        Dim smallImage As Image = Image.FromFile("yourfile.jpg")
        e.Graphics.DrawImage(smallImage, New Rectangle(100, 100, 100, 100), 0, 0, smallImage.Width, smallImage.Height, GraphicsUnit.Pixel, imgAttributes)
    End Sub
  
    Private Sub trackBar1_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles trackBar1.Scroll
        tpVal = CSng(trackBar1.Value) / 10
        Me.Invalidate()
    End Sub
End Class

Clear ImageAttributes

Imports System.Drawing
Imports System.Drawing.Imaging
public class Test
   public Shared Sub Main
        Dim ImgAttr As ImageAttributes = New ImageAttributes
        ImgAttr.ClearColorKey(ColorAdjustType.Default)
   End Sub
End class

Draw image with ImageAttributes settings

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Drawing.Imaging
public class RecoloringFormDemo
   public Shared Sub Main
        Application.Run(New RecoloringForm)
   End Sub
End class
Public Class RecoloringForm
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
        Me.SetStyle(ControlStyles.ResizeRedraw, True)
        Me.SetStyle(ControlStyles.DoubleBuffer, True)
        Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents groupBox2 As System.Windows.Forms.GroupBox
    Friend WithEvents panel2 As System.Windows.Forms.Panel
    Friend WithEvents splitter1 As System.Windows.Forms.Splitter
    Friend WithEvents groupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents panel1 As System.Windows.Forms.Panel
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.groupBox2 = New System.Windows.Forms.GroupBox()
        Me.panel2 = New System.Windows.Forms.Panel()
        Me.splitter1 = New System.Windows.Forms.Splitter()
        Me.groupBox1 = New System.Windows.Forms.GroupBox()
        Me.panel1 = New System.Windows.Forms.Panel()
        Me.groupBox2.SuspendLayout()
        Me.groupBox1.SuspendLayout()
        Me.SuspendLayout()
        "
        "groupBox2
        "
        Me.groupBox2.Controls.AddRange(New System.Windows.Forms.Control() {Me.panel2})
        Me.groupBox2.Dock = System.Windows.Forms.DockStyle.Fill
        Me.groupBox2.Location = New System.Drawing.Point(187, 0)
        Me.groupBox2.Name = "groupBox2"
        Me.groupBox2.Size = New System.Drawing.Size(205, 182)
        Me.groupBox2.TabIndex = 5
        Me.groupBox2.TabStop = False
        Me.groupBox2.Text = "Mapped Colors"
        "
        "panel2
        "
        Me.panel2.BackColor = System.Drawing.Color.White
        Me.panel2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.panel2.Dock = System.Windows.Forms.DockStyle.Fill
        Me.panel2.Location = New System.Drawing.Point(3, 16)
        Me.panel2.Name = "panel2"
        Me.panel2.Size = New System.Drawing.Size(199, 163)
        Me.panel2.TabIndex = 0
        "
        "splitter1
        "
        Me.splitter1.Location = New System.Drawing.Point(184, 0)
        Me.splitter1.Name = "splitter1"
        Me.splitter1.Size = New System.Drawing.Size(3, 182)
        Me.splitter1.TabIndex = 4
        Me.splitter1.TabStop = False
        "
        "groupBox1
        "
        Me.groupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.panel1})
        Me.groupBox1.Dock = System.Windows.Forms.DockStyle.Left
        Me.groupBox1.Name = "groupBox1"
        Me.groupBox1.Size = New System.Drawing.Size(184, 182)
        Me.groupBox1.TabIndex = 3
        Me.groupBox1.TabStop = False
        Me.groupBox1.Text = "Original Colors"
        "
        "panel1
        "
        Me.panel1.BackColor = System.Drawing.Color.White
        Me.panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.panel1.Location = New System.Drawing.Point(3, 16)
        Me.panel1.Name = "panel1"
        Me.panel1.Size = New System.Drawing.Size(178, 163)
        Me.panel1.TabIndex = 0
        "
        "RecoloringForm
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(392, 182)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.groupBox2, Me.splitter1, Me.groupBox1})
        Me.Name = "RecoloringForm"
        Me.Text = "RecoloringForm"
        Me.groupBox2.ResumeLayout(False)
        Me.groupBox1.ResumeLayout(False)
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub panel1_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles panel1.Paint
        Dim g As Graphics = e.Graphics
        Dim bmp As Bitmap = New Bitmap("yourfile.jpg")
        Dim rect As Rectangle = New Rectangle(0, 0, bmp.Width, bmp.Height)
        rect.Offset((Me.panel1.ClientRectangle.Width - rect.Width) / 2, (Me.panel1.ClientRectangle.Height - rect.Height) / 2)
        g.DrawImage(bmp, rect)
    End Sub
    Private Sub panel2_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles panel2.Paint
        Dim g As Graphics = e.Graphics
        Dim bmp As Bitmap = New Bitmap("yourfile.jpg")
        Dim colorMap As ColorMap() = New ColorMap() {New ColorMap()}
        colorMap(0).OldColor = bmp.GetPixel(0, bmp.Height - 1)
        colorMap(0).NewColor = Color.Red
        Dim attr As ImageAttributes = New ImageAttributes()
        attr.SetRemapTable(colorMap)
        Dim rect As Rectangle = New Rectangle(0, 0, bmp.Width, bmp.Height)
        rect.Offset((Me.panel2.ClientRectangle.Width - rect.Width) / 2, (Me.panel2.ClientRectangle.Height - rect.Height) / 2)
        g.DrawImage(bmp, rect, 0, 0, rect.Width, rect.Height, g.PageUnit, attr)
    End Sub
End Class

ImageAttributes.SetBrushRemapTable

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Drawing.Imaging
public class SetRemapTable
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
public class Form1
  Inherits System.Windows.Forms.Form
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim clrMapTable(1) As ColorMap
        clrMapTable(0) = New ColorMap
        clrMapTable(0).OldColor = Color.Red
        clrMapTable(0).NewColor = Color.Green
        Dim ImgAttr As New ImageAttributes
        ImgAttr.SetBrushRemapTable(clrMapTable)
        Dim curImage As Image = Image.FromFile("yourfile.jpg")
        g.DrawImage(curImage, 0, 0)
        Dim rect As New Rectangle(0, 0, 400, 400)
        g.DrawImage(curImage, rect, 0, 0, 400, 400, GraphicsUnit.Pixel, ImgAttr)
        " Dispose
        g.Dispose()
  End Sub
  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
  End Sub
End Class

ImageAttributes.SetColorKey

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class SetColorKey
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
public class Form1
  Inherits System.Windows.Forms.Form
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim lClr As Color = Color.FromArgb(245, 0, 0)
        Dim uClr As Color = Color.FromArgb(255, 0, 0)
        Dim ImgAttr As New ImageAttributes
        ImgAttr.SetColorKey(lClr, uClr, ColorAdjustType.Default)
        Dim curImage As Image = Image.FromFile("yourfile.jpg")
        g.DrawImage(curImage, 0, 0)
        Dim rect As New Rectangle(0, 0, 400, 400)
        g.DrawImage(curImage, rect, 0, 0, 400, 400, GraphicsUnit.Pixel, ImgAttr)
        g.Dispose()
  End Sub
  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
  End Sub
End Class

ImageAttributes.SetGamma

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class SetGamma
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
public class Form1
  Inherits System.Windows.Forms.Form
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim lClr As Color = Color.FromArgb(245, 0, 0)
        Dim uClr As Color = Color.FromArgb(255, 0, 0)
        Dim ImgAttr As New ImageAttributes
        ImgAttr.SetGamma(2.0F, ColorAdjustType.Default)
        Dim curImage As Image = Image.FromFile("yourfile.jpg")
        g.DrawImage(curImage, 0, 0)
        Dim rect As New Rectangle(0, 0, 400, 400)
        g.DrawImage(curImage, rect, 0, 0, 400, 400, GraphicsUnit.Pixel, ImgAttr)
        " Dispose
        g.Dispose()

  End Sub
  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
  End Sub
End Class

ImageAttributes.SetThreshold

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class SetThreashold
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
public class Form1
  Inherits System.Windows.Forms.Form
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim lClr As Color = Color.FromArgb(245, 0, 0)
        Dim uClr As Color = Color.FromArgb(255, 0, 0)
        Dim ImgAttr As New ImageAttributes
        ImgAttr.SetThreshold(0.7F, ColorAdjustType.Default)
        Dim curImage As Image = Image.FromFile("yourfile.jpg")
        g.DrawImage(curImage, 0, 0)
        Dim rect As New Rectangle(0, 0, 400, 400)
        g.DrawImage(curImage, rect, 0, 0, 400, 400, GraphicsUnit.Pixel, ImgAttr)
        " Dispose
        g.Dispose()

  End Sub
  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
  End Sub
End Class

ImageAttributes.SetWrapMode

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class SetWrapMode
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
public class Form1
  Inherits System.Windows.Forms.Form
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim ImgAttr As New ImageAttributes
        ImgAttr.SetWrapMode(WrapMode.Tile)
        Dim curImage As Image = Image.FromFile("yourfile.jpg")
        Dim rect As New Rectangle(0, 0, 400, 400)
        g.DrawImage(curImage, rect, 0, 0, 400, 400, GraphicsUnit.Pixel, ImgAttr)
        g.Dispose()
  End Sub
  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
  End Sub
End Class