Pengolahan Citra VB.Net [TUGAS]

Public Class Form1
    Dim gambar As Bitmap
    Private Sub OpenToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenToolStripMenuItem.Click
        OFD.Filter = "BMP|*.bmp|JPG|*.Jpg"
        OFD.ShowDialog()

        If OFD.FileName = "" Then Exit Sub
        PIC1.Image = Image.FromFile(OFD.FileName)
        gambar = New Bitmap(PIC1.Image)
    End Sub

  Private Sub SaveCitraToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveCitraToolStripMenuItem.Click
        SFD.Filter = "JPG|*.Jpg|BMP|*.bmp"
        SFD.ShowDialog()
        If SFD.FileName = "" Then Exit Sub
        If SFD.FilterIndex = 1 Then
            gambar.Save(SFD.FileName, System.Drawing.Imaging.ImageFormat.Jpeg)
        End If
        If SFD.FilterIndex = 2 Then
            gambar.Save(SFD.FileName, System.Drawing.Imaging.ImageFormat.Bmp)
        End If
    End Sub

 Private Sub GrayssclToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GrayssclToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim Rt, vM, vH, vB As Double
        With gambar
            For Pb = 0 To .Height - 1
                For Pc = 0 To .Width - 1
                    vM = .GetPixel(Pc, Pb).R
                    vH = .GetPixel(Pc, Pb).G
                    vB = .GetPixel(Pc, Pb).B
                    Rt = (vM + vH + vB) / 3
                    .SetPixel(Pc, Pb, Color.FromArgb(Rt, Rt, Rt))
                Next
                PIC2.Image = gambar
                PIC2.Refresh()
            Next
        End With
    End Sub

Private Sub NegativeToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NegativeToolStripMenuItem.Click
    Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double
        With gambar
            For Pb = 0 To .Height - 1
                For Pc = 0 To .Width - 1
                    vM = 255 - .GetPixel(Pc, Pb).R
                    vH = 255 - .GetPixel(Pc, Pb).G
                    vB = 255 - .GetPixel(Pc, Pb).B
                    If vM <= 0 Then vM = 0
                    If vB <= 0 Then vB = 0
                    If vH <= 0 Then vH = 0
                    .SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
                Next
                PIC2.Image = gambar
                PIC2.Refresh()
            Next
        End With
    End Sub

Private Sub BrignessToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BrignessToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double
        With gambar
            For Pb = 0 To .Height - 1
                For Pc = 0 To .Width - 1
                    vM = .GetPixel(Pc, Pb).R + 5
                    vH = .GetPixel(Pc, Pb).G + 5
                    vB = .GetPixel(Pc, Pb).B + 5
                    If vM > 255 Then vM = 255
                    If vB > 255 Then vB = 255
                    If vH > 255 Then vH = 255
                    .SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
                Next
                PIC2.Image = gambar
                PIC2.Refresh()
            Next
        End With
    End Sub

 Private Sub ToolsToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolsToolStripMenuItem.Click
        gambar = New Bitmap(PIC1.Image)
    End Sub

    Private Sub KeluarToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles KeluarToolStripMenuItem.Click
        End
    End Sub

 Private Sub BinerToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BinerToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim rata, vM, vH, vB As Double
        With gambar
            For Pb = 0 To .Height - 1
                For Pc = 0 To .Width - 1
                    vM = .GetPixel(Pc, Pb).R
                    vH = .GetPixel(Pc, Pb).G
                    vB = .GetPixel(Pc, Pb).B
                    rata = (vM + vH + vB) / 3
                    If (rata < 128) Then
                        vM = 0
                        vH = 0
                        vB = 0
                    Else
                        vM = 255
                        vH = 255
                        vB = 255
                    End If

                    .SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
                Next
                PIC2.Image = gambar
                PIC2.Refresh()
            Next
        End With

  Private Sub RotateToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RotateToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double
        Dim gambar3 As Bitmap = New Bitmap(PIC1.Image)
        With gambar
            For Pb = .Height - 1 To 0 Step -1
                For Pc = .Width - 1 To 0 Step -1
                    vM = .GetPixel(Pc, Pb).R
                    vH = .GetPixel(Pc, Pb).G
                    vB = .GetPixel(Pc, Pb).B
                    gambar3.SetPixel(.Width - 1 - Pc, .Height - 1 - Pb, Color.FromArgb(vM, vH, vB))
                Next
                PIC2.Image = gambar3
                PIC2.Refresh()
            Next
        End With
        gambar = gambar3
    End Sub