VB.Net Tutorial/2D Graphics/Image Color

Gray Scale Image

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class GrayScaleImage
   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 curBitmap As New Bitmap("yourfile.jpg")
        g.DrawImage(curBitmap, 0, 0, curBitmap.Width, curBitmap.Height) "
        Dim i As Integer
        For i = 0 To 100
            Dim j As Integer
            For j = 0 To 100
                Dim curColor As Color = curBitmap.GetPixel(i, j)
                Dim ret As Integer = (curColor.R + curColor.G + curColor.B) / 3
                "curBitmap.SetPixel(i, j, Color.FromArgb(ret, ret, ret))
            Next j
        Next i
        g.DrawImage(curBitmap, 0, 0, curBitmap.Width, curBitmap.Height)
        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

Pick a color from an Image

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class ColorPicker
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    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
    Private components As System.ruponentModel.IContainer
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SuspendLayout()
        "
        "PictureBox1
        "
        Me.PictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.PictureBox1.Dock = System.Windows.Forms.DockStyle.Top
        Me.PictureBox1.Image = Image.FromFile("YourFile.bmp")
        Me.PictureBox1.Location = New System.Drawing.Point(0, 0)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(292, 216)
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(24, 232)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 24)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "R:"
        "
        "Label2
        "
        Me.Label2.Location = New System.Drawing.Point(112, 232)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(64, 24)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "G:"
        "
        "Label3
        "
        Me.Label3.Location = New System.Drawing.Point(208, 232)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(64, 24)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "B:"
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem3})
        Me.MenuItem1.Text = "File"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Open"
        "
        "MenuItem3
        "
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "Exit"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 270)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.PictureBox1)
        Me.Menu = Me.MainMenu1
        Me.ResumeLayout(False)
    End Sub
    Dim pic As Bitmap
    Dim c As System.Drawing.Color
    Dim xwidth, yheight As Integer
    Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
        pic = PictureBox1.Image
        xwidth = pic.Width
        yheight = pic.Height
        If e.X < xwidth And e.Y < yheight Then
            c = pic.GetPixel(e.X, e.Y)
            Label1.Text = "R:" + c.R.ToString
            Label2.Text = "G:" + c.G.ToString
            Label3.Text = "B:" + c.B.ToString
        End If
    End Sub
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        OpenFileDialog1.ShowDialog()
        PictureBox1.Image = New Bitmap(OpenFileDialog1.FileName)
    End Sub
    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        End
    End Sub
End Class

Recolor Image

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RecoloringTranslation
   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 curBitmap As New Bitmap("yourfile.jpg")
        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, 1, 0}, New Single() {0.9F, 0.0F, 0.0F, 0.0F, 1}}
        Dim clrMatrix As New ColorMatrix(ptsArray)
        Dim imgAttribs As New ImageAttributes
        imgAttribs.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Default)
        g.DrawImage(curBitmap, 0, 0, 200, 200)
        g.DrawImage(curBitmap, New Rectangle(205, 0, 200, 200), 0, 0, curBitmap.Width, curBitmap.Height, GraphicsUnit.Pixel, imgAttribs)
        curBitmap.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

Recolor image rotation

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RecoloringRotation
   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 degrees As Single = 45.0F
        Dim r As Double = degrees * System.Math.PI / 180
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim curBitmap As New Bitmap("yourfile.jpg")
        Dim ptsArray As Single()() = {New Single() {CSng(System.Math.Cos(r)), CSng(System.Math.Sin(r)), 0, 0, 0}, New Single() {CSng(-System.Math.Sin(r)), CSng(-System.Math.Cos(r)), 0, 0, 0}, New Single() {0.5F, 0, 1, 0, 0}, New Single() {0, 0, 0, 1, 0}, New Single() {0, 0, 0, 0, 1}}
        Dim clrMatrix As New ColorMatrix(ptsArray)
        Dim imgAttribs As New ImageAttributes
        imgAttribs.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Default)
        g.DrawImage(curBitmap, 0, 0, 200, 200)
        g.DrawImage(curBitmap, New Rectangle(205, 0, 200, 200), 0, 0, curBitmap.Width, curBitmap.Height, GraphicsUnit.Pixel, imgAttribs)
        curBitmap.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

Recolor image Scaling

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RecoloringScaling
   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 curBitmap As New Bitmap("yourfile.jpg")
        Dim ptsArray As Single()() = {New Single() {1, 0, 0, 0, 0}, New Single() {0, 0.8F, 0, 0, 0}, New Single() {0, 0, 0.5F, 0, 0}, New Single() {0, 0, 0, 0.5F, 0}, New Single() {0, 0, 0, 0, 1}}
        Dim clrMatrix As New ColorMatrix(ptsArray)
        Dim imgAttribs As New ImageAttributes
        imgAttribs.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Default)
        g.DrawImage(curBitmap, 0, 0, 200, 200)
        g.DrawImage(curBitmap, New Rectangle(205, 0, 200, 200), 0, 0, curBitmap.Width, curBitmap.Height, GraphicsUnit.Pixel, imgAttribs)
        curBitmap.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

Recolor image shearing

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RecoloringShearing
   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 curBitmap As New Bitmap("yourfile.jpg")
        Dim ptsArray As Single()() = {New Single() {1, 0, 0, 0, 0}, New Single() {0, 1, 0, 0, 0}, New Single() {0.5F, 0, 1, 0, 0}, New Single() {0, 0, 0, 1, 0}, New Single() {0, 0, 0, 0, 1}}
        Dim clrMatrix As New ColorMatrix(ptsArray)
        Dim imgAttribs As New ImageAttributes
        imgAttribs.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Default)
        g.DrawImage(curBitmap, 0, 0, 200, 200)
        g.DrawImage(curBitmap, New Rectangle(205, 0, 200, 200), 0, 0, curBitmap.Width, curBitmap.Height, GraphicsUnit.Pixel, imgAttribs)
        curBitmap.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