VB.Net/2D/Bitmap

Bitmap Information: Width, Height, Vertical Resolution, Pixel Format, Physical Dimension

Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Drawing.Imaging
Public Class MainClass
  Shared Sub Main()
    Dim Bmp As Bitmap = New Bitmap("figure2.bmp")
    Console.WriteLine(Bmp.Height.ToString())
    Console.WriteLine(Bmp.Width.ToString())
    Console.WriteLine(Bmp.VerticalResolution.ToString())
    Console.WriteLine(Bmp.HorizontalResolution.ToString())
    Console.WriteLine(Bmp.PixelFormat.ToString())
    Console.WriteLine(Bmp.Size.ToString())
    Console.WriteLine(Bmp.PhysicalDimension.ToString())
  End Sub
  
End Class

Draw to a Bitmap object and save it as a image file

Imports System
Imports System.Windows.Forms
Imports System.Collections.Generic
Imports System.ruponentModel
Imports System.Drawing.Imaging
Imports System.Drawing
Public Class MainClass
   Shared Sub Main()
        Dim bm As New Bitmap(256, 256)
        " Draw on it.
        Dim gr As Graphics = Graphics.FromImage(bm)
        gr.Clear(Color.White)
        gr.DrawEllipse(Pens.Red, 0, 0, bm.Width - 1, bm.Height - 1)
        gr.DrawLine(Pens.Green, 0, 0, bm.Width - 1, bm.Height - 1)
        gr.DrawLine(Pens.Blue, bm.Width - 1, 0, 0, bm.Height - 1)
        " Save the result as a JPEG file.
        bm.Save("test.gif", ImageFormat.Gif)
   End Sub 
End Class

Load an Image from file and draw on the loaded image

Imports System
Imports System.Windows.Forms
Imports System.Collections.Generic
Imports System.ruponentModel
Imports System.Drawing.Imaging
Imports System.Drawing
Public Class MainClass
   Shared Sub Main()
      Dim form1 As new Form1()
      Application.Run(form1)
   End Sub 
End Class
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim bm As New Bitmap("figure2.bmp")
        " Make a copy.
        Dim new_bm As New Bitmap(bm)
        " Dispose of the original Bitmap.
        bm.Dispose()
        " Draw on the new Bitmap and display the result.
        Dim gr As Graphics = Graphics.FromImage(new_bm)
        gr.DrawEllipse(Pens.White, 0, 0, new_bm.Width - 1, new_bm.Height - 1)
        picImage.Image = new_bm
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        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.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.picImage = New System.Windows.Forms.PictureBox
        CType(Me.picImage, System.ruponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        "
        "picImage
        "
        Me.picImage.AutoSize = True
        Me.picImage.Location = New System.Drawing.Point(0, 0)
        Me.picImage.Name = "picImage"
        Me.picImage.Size = New System.Drawing.Size(100, 50)
        Me.picImage.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize
        Me.picImage.TabIndex = 0
        Me.picImage.TabStop = False
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(240, 256)
        Me.Controls.Add(Me.picImage)
        Me.Name = "Form1"
        Me.Text = "LoadPicture"
        CType(Me.picImage, System.ruponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents picImage As System.Windows.Forms.PictureBox
End Class

Manipulate Bitmap Color

Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Drawing.Imaging
Public Class MainClass
  Shared Sub Main()
     Dim form1 As Form1 = new Form1
     Application.Run(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.
  <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
    "
    "Form1
    "
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.Name = "Form1"
    Me.Text = "Form1"
  End Sub
#End Region
  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  End Sub
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
    Dim bmp As Bitmap = New Bitmap("figure2.bmp")
    Dim c As Color
    Dim x, y As Int32
    e.Graphics.DrawImage(bmp, 10, 30)
    For x = 0 To bmp.Width - 1
      For y = 0 To bmp.Height - 1
        c = bmp.GetPixel(x, y)
        c = Color.FromArgb(c.ToArgb() + 100)
        bmp.SetPixel(x, y, c)
      Next
    Next
    e.Graphics.DrawImage(bmp, 150, 30)
  End Sub
End Class

Output Color Palette for a Bitmap

Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Drawing.Imaging
Public Class MainClass
  Shared Sub Main()
    Dim cp As ColorPalette
    Dim bmp As Bitmap = New Bitmap("figure2.bmp")
    cp = bmp.Palette
    Dim c As Color
    For Each c In cp.Entries
      Console.WriteLine( c.ToString())
    Next
  End Sub
  
End Class