Change Image Attributes : ImageAttributes « 2D Graphics « VB.Net Tutorial






Change Image Attributes
Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ComponentModel
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.ComponentModel.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.ComponentModel.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.ComponentModel.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








17.53.ImageAttributes
17.53.1.Clear ImageAttributes
17.53.2.Draw image with ImageAttributes settingsDraw image with ImageAttributes settings
17.53.3.ImageAttributes.SetColorKeyImageAttributes.SetColorKey
17.53.4.ImageAttributes.SetWrapModeImageAttributes.SetWrapMode
17.53.5.Change Image AttributesChange Image Attributes
17.53.6.ImageAttributes.SetGammaImageAttributes.SetGamma
17.53.7.ImageAttributes.SetThresholdImageAttributes.SetThreshold
17.53.8.ImageAttributes.SetBrushRemapTable