Make Bitmap transparent : Bitmap « 2D Graphics « VB.Net Tutorial






Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
public class MakeTransparentBitmap
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1

    Private Sub Form1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Click
        Me.Close()
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        Dim bm As Bitmap = new Bitmap("yourfile.jpg")

        bm.MakeTransparent(bm.GetPixel(1, 1))

        e.Graphics.DrawImage(bm, 0, 0)
    End Sub
End Class
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected 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.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.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.SuspendLayout()
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(203, 201)
        Me.ControlBox = False
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
        Me.Name = "Form1"
        Me.TransparencyKey = System.Drawing.SystemColors.Control
        Me.ResumeLayout(False)

    End Sub

End Class








17.67.Bitmap
17.67.1.Create an Bitmap and paint on itCreate an Bitmap and paint on it
17.67.2.Create Bitmap from IconCreate Bitmap from Icon
17.67.3.Set Resolution for BitmapSet Resolution for Bitmap
17.67.4.Set Pixel for BitmapSet Pixel for Bitmap
17.67.5.Make Bitmap transparent