Contoh pengolahan citra pada vb.net

pada malam ini berhubung karna ada waktu  luang untuk memostingka artikel maka saya akan memmbahas sedikit mengenai pengolahan citra pada vb.net,mugkin contoh ini sangat sederhana tapi semoga bermanfaat ya,buat saudara yang membutuhkannya..
langsung saja ke pokok masalahnya.sebelumnya silakan buat desain anda seperti gambar berikut

 

pada menu strip file silahkan masukkan isinya open citra,save citra dan keluar sedangkan pada manipulasi ctra isikan dengan Default gambar,grayscale,brigthness,rotate(90,180,270),Biner,contrast,smoothing dan pada pengaturan RGB isikan dengan  +Merah,-Merah,+Hijau,-Hijau,+Biru dan -Biru

silahkan tambakan lagi dengan OpenFileDialog1 ganti name dengan OFD,SaveFileDialog1 dengan name SFD dan tambahkan lagi ProgressBar1.perhatikan gambar dibawah

 

maka listing programmnya ..

Public Class Form1
    Dim gambar As Bitmap
    Private Sub OpenCitraToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenCitraToolStripMenuItem.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.Name)
    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.Filter = 2 Then
            gambar.Save(SFD.FileName, System.Drawing.Imaging.ImageFormat.Bmp)
        End If
    End Sub

    Private Sub GrayscaleToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GrayscaleToolStripMenuItem.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 NegatifToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NegatifToolStripMenuItem.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 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
    End Sub
    Private Sub DefaultGambarToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DefaultGambarToolStripMenuItem.Click
        gambar = New Bitmap(Pic1.Image)
    End Sub
    Private Sub BrightnessToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BrightnessToolStripMenuItem.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 HijauTToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles HijauTToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double

        Dim gambar2 = New Bitmap(Pic2.Image)
        For Pb = 0 To gambar2.Height - 1
            For Pc = 0 To gambar2.Width - 1
                vM = gambar2.GetPixel(Pc, Pb).R
                vH = gambar2.GetPixel(Pc, Pb).G + 10
                vB = gambar2.GetPixel(Pc, Pb).B
                If vH >= 255 Then vH = 255
                gambar2.SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
            Next
            Pic2.Image = gambar2
            Pic2.Refresh()
        Next
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Pic2.Image = Pic1.Image
    End Sub

    Private Sub HijauKToolStripMenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles HijauKToolStripMenuItem1.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double

        Dim gambar2 = New Bitmap(Pic2.Image)
        For Pb = 0 To gambar2.Height - 1
            For Pc = 0 To gambar2.Width - 1
                vM = gambar2.GetPixel(Pc, Pb).R
                vH = gambar2.GetPixel(Pc, Pb).G - 10
                vB = gambar2.GetPixel(Pc, Pb).B
                If vH <= 0 Then vH = 0
                gambar2.SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
            Next
            Pic2.Image = gambar2
            Pic2.Refresh()
        Next
    End Sub

    Private Sub MerahTToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MerahTToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double

        Dim gambar2 = New Bitmap(Pic2.Image)
        For Pb = 0 To gambar2.Height - 1
            For Pc = 0 To gambar2.Width - 1
                vM = gambar2.GetPixel(Pc, Pb).R + 10
                vH = gambar2.GetPixel(Pc, Pb).G
                vB = gambar2.GetPixel(Pc, Pb).B
                If vM >= 255 Then vM = 255
                gambar2.SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
            Next
            Pic2.Image = gambar2
            Pic2.Refresh()
        Next
    End Sub

    Private Sub MerahKToolStripMenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MerahKToolStripMenuItem1.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double

        Dim gambar2 = New Bitmap(Pic2.Image)
        For Pb = 0 To gambar2.Height - 1
            For Pc = 0 To gambar2.Width - 1
                vM = gambar2.GetPixel(Pc, Pb).R - 10
                vH = gambar2.GetPixel(Pc, Pb).G
                vB = gambar2.GetPixel(Pc, Pb).B
                If vM <= 0 Then vM = 0
                gambar2.SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
            Next
            Pic2.Image = gambar2
            Pic2.Refresh()
        Next
    End Sub

    Private Sub BiruTToolStripMenuItem_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BiruTToolStripMenuItem.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double

        Dim gambar2 = New Bitmap(Pic2.Image)
        For Pb = 0 To gambar2.Height - 1
            For Pc = 0 To gambar2.Width - 1
                vM = gambar2.GetPixel(Pc, Pb).R
                vH = gambar2.GetPixel(Pc, Pb).G
                vB = gambar2.GetPixel(Pc, Pb).B + 10
                If vB >= 255 Then vB = 255
                gambar2.SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
            Next
            Pic2.Image = gambar2
            Pic2.Refresh()
        Next
    End Sub

    Private Sub BiruKToolStripMenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BiruKToolStripMenuItem1.Click
        Dim Pb, Pc As Integer
        Dim vM, vH, vB As Double

        Dim gambar2 = New Bitmap(Pic2.Image)
        For Pb = 0 To gambar2.Height - 1
            For Pc = 0 To gambar2.Width - 1
                vM = gambar2.GetPixel(Pc, Pb).R
                vH = gambar2.GetPixel(Pc, Pb).G
                vB = gambar2.GetPixel(Pc, Pb).B - 10
                If vB <= 0 Then vB = 0
                gambar2.SetPixel(Pc, Pb, Color.FromArgb(vM, vH, vB))
            Next
            Pic2.Image = gambar2
            Pic2.Refresh()
        Next
    End Sub
    Private Sub ContrastToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ContrastToolStripMenuItem.Click
        Dim gambar2 = New Bitmap(Pic2.Image)
        Pic2.Image = gambar2
        Dim tempbmp As New Bitmap(Pic2.Image)
        Dim DX As Integer = 1
        Dim DY As Integer = 1
        Dim Red, Green, Blue As Integer
        Dim X, Y As Integer
        Dim tc As Integer
        tc = 5
        ProgressBar1.Width = Pic1.Width
        ProgressBar1.Show()
        With tempbmp
            For X = DX To .Height - DX - 1
                For Y = DY To .Width - DY - 1
                    Red = CInt(.GetPixel(Y, X).R) 'ambil nilai warna merah (Red) pada pixel(Y,X)
                    Green = CInt(.GetPixel(Y, X).G) 'ambil nilai warna hijau (Green) pada pixel(Y,X)
                    Blue = CInt(.GetPixel(Y, X).B) 'ambil nilai warna biru (Blue) pada pixel(Y,X)
                    'Grey = (Red + Green + Blue) / 3 'konversi warna pada pixel Y,X ke grey
                    Red = Red * tc
                    Blue = Blue * tc
                    Green = Green * tc
                    If (Red > 255) Then
                        Red = 255
                    End If
                    If (Blue > 255) Then
                        Blue = 255
                    End If
                    If (Green > 255) Then
                        Green = 255
                    End If
                    gambar2.SetPixel(Y, X, Color.FromArgb(Red, Green, Blue)) 'simpan warna baru pada pixel(Y,X)
                Next
                If X Mod 10 = 0 Then
                    Pic2.Invalidate()
                    Me.Text = "Progres Proses contrast : " & Int(100 * X / (Pic1.Image.Height - 2)).ToString & "%"
                    ProgressBar1.Value = Int(100 * X / (Pic1.Image.Height - 2))
                    Pic2.Refresh()
                End If
            Next
        End With
        ProgressBar1.Hide()
        Pic2.Refresh()
        Me.Text = "Pengolahan Citra : Proses contrast berhasil"
    End Sub
    Private Sub ToolStripMenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem3.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
    Private Sub Rotasi(ByVal s As RotateFlipType)
        Dim gambar2 = New Bitmap(Pic2.Image)
        gambar2 = New Bitmap(Pic2.Image)
        Pic2.Image = gambar2
        gambar2.RotateFlip(s)
        Pic2.Image = gambar2
    End Sub
    Private Sub ToolStripMenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem2.Click
        Rotasi(RotateFlipType.Rotate90FlipNone)
    End Sub
    Private Sub ToolStripMenuItem4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem4.Click
        Rotasi(RotateFlipType.Rotate270FlipNone)
    End Sub
    Private Sub SmoothingToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SmoothingToolStripMenuItem.Click
        Dim gambar2 = New Bitmap(Pic2.Image)
        Dim MF(2, 2) As Double
        'MaskFilter.Show()
        'matriks Filter
        '  0 1 2
        '0 a b c
        '1 d e f
        '2 g h i
        'Filter smoothing
        MF(0, 0) = 1 / 9 'a
        MF(0, 1) = 1 / 9 'b
        MF(0, 2) = 1 / 9 'c
        MF(1, 0) = 1 / 9 'd
        MF(1, 1) = 1 / 9 'e
        MF(1, 2) = 1 / 9 'f
        MF(2, 0) = 1 / 9 'g
        MF(2, 1) = 1 / 9 'h
        MF(2, 2) = 1 / 9 'i
        gambar2 = New Bitmap(Pic2.Image)
        Pic2.Image = gambar2
        Dim tempbmp As New Bitmap(Pic2.Image)
        Dim DX As Integer = 1
        Dim DY As Integer = 1
        Dim Red As Integer, Green As Integer, Blue As Integer
        Dim i As Integer, j As Integer
        ProgressBar1.Width = Pic1.Width
        ProgressBar1.Show()

        With gambar2
            For i = DX To .Height - DX - 1
                For j = DY To .Width - DY - 1
                    'proses matriks filter
                    'point(j,i)*e --> titik tengah
                    Red = CInt(.GetPixel(j, i).R) * MF(1, 1)
                    Green = CInt(.GetPixel(j, i).G) * MF(1, 1)
                    Blue = CInt(.GetPixel(j, i).B) * MF(1, 1)
                    'proses titik tetangga
                    'point(j-1,i-1)*a--> MF(0,0)--> titik kiri atas
                    If j - 1 < 1 And i - 1 < 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(0, 0))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(0, 0))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(0, 0))
                    Else
                        Red = Red + (CInt(.GetPixel(j - 1, i - 1).R) * MF(0, 0))
                        Green = Green + (CInt(.GetPixel(j - 1, i - 1).G) * MF(0, 0))
                        Blue = Blue + (CInt(.GetPixel(j - 1, i - 1).B) * MF(0, 0))
                    End If
                    'point(j,i-1)*b --> MF(0,1) --> titik atas
                    If i - 1 < 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(0, 1))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(0, 1))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(0, 1))
                    Else
                        Red = Red + (CInt(.GetPixel(j, i - 1).R) * MF(0, 1))
                        Green = Green + (CInt(.GetPixel(j, i - 1).G) * MF(0, 1))
                        Blue = Blue + (CInt(.GetPixel(j, i - 1).B) * MF(0, 1))
                    End If
                    'point(j+1,i-1)*c --> MF(0,2) --> titik kanan atas
                    If j + 1 > .Width - DY - 1 And i - 1 > 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(0, 2))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(0, 2))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(0, 2))
                    Else
                        Red = Red + (CInt(.GetPixel(j + 1, i - 1).R) * MF(0, 2))
                        Green = Green + (CInt(.GetPixel(j + 1, i - 1).G) * MF(0, 2))
                        Blue = Blue + (CInt(.GetPixel(j + 1, i - 1).B) * MF(0, 2))
                    End If
                    'point(j-1,i)*d --> MF(1,0) --> titik kiri
                    If j - 1 < 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(1, 0))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(1, 0))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(1, 0))
                    Else
                        Red = Red + (CInt(.GetPixel(j - 1, i).R) * MF(1, 0))
                        Green = Green + (CInt(.GetPixel(j - 1, i).G) * MF(1, 0))
                        Blue = Blue + (CInt(.GetPixel(j - 1, i).B) * MF(1, 0))
                    End If
                    'point(j+1,i)*f --> MF(1,2) --> titik kanan 
                    If j + 1 > .Width - DY - 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(1, 2))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(1, 2))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(1, 2))
                    Else
                        Red = Red + (CInt(.GetPixel(j + 1, i).R) * MF(1, 2))
                        Green = Green + (CInt(.GetPixel(j + 1, i).G) * MF(1, 2))
                        Blue = Blue + (CInt(.GetPixel(j + 1, i).B) * MF(1, 2))
                    End If
                    'point(j-1,i+1)*g --> MF(2,0) --> titik kiri bawah
                    If j - 1 < 1 And i + 1 > .Height - DX - 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(2, 0))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(2, 0))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(2, 0))
                    Else
                        Red = Red + (CInt(.GetPixel(j - 1, i + 1).R) * MF(2, 0))
                        Green = Green + (CInt(.GetPixel(j - 1, i + 1).G) * MF(2, 0))
                        Blue = Blue + (CInt(.GetPixel(j - 1, i + 1).B) * MF(2, 0))
                    End If
                    'point(j,i+1)*g --> MF(2,1) --> titik bawah
                    If i + 1 > .Height - DX - 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(2, 1))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(2, 1))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(2, 1))
                    Else
                        Red = Red + (CInt(.GetPixel(j, i + 1).R) * MF(2, 1))
                        Green = Green + (CInt(.GetPixel(j, i + 1).G) * MF(2, 1))
                        Blue = Blue + (CInt(.GetPixel(j, i + 1).B) * MF(2, 1))
                    End If
                    'point(j+1,i+1)*h --> MF(2,2) --> titik kanan bawah
                    If j + 1 > .Width - DY - 1 And i + 1 > .Height - DX - 1 Then 'jika out of border ambil nilai tengah/point(x,y)
                        Red = Red + (CInt(.GetPixel(j, i).R) * MF(2, 2))
                        Green = Green + (CInt(.GetPixel(j, i).G) * MF(2, 2))
                        Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(2, 2))
                    Else
                        Red = Red + (CInt(.GetPixel(j + 1, i + 1).R) * MF(2, 2))
                        Green = Green + (CInt(.GetPixel(j + 1, i + 1).G) * MF(2, 2))
                        Blue = Blue + (CInt(.GetPixel(j + 1, i + 1).B) * MF(2, 2))
                    End If
                    'normalisasi
                    If Red < 0 Then
                        Red = 0
                    Else
                        If Red > 255 Then
                            Red = 255
                        End If
                    End If
                    If Green < 0 Then
                        Green = 0
                    Else
                        If Green > 255 Then
                            Green = 255
                        End If
                    End If
                    If Blue < 0 Then
                        Blue = 0
                    Else
                        If Blue > 255 Then
                            Blue = 255
                        End If
                    End If
                    'simpan warna hasil smoothing ke point j,i
                    gambar2.SetPixel(j, i, Color.FromArgb(Red, Green, Blue))
                Next
                If i Mod 10 = 0 Then
                    Pic1.Invalidate()
                    Me.Text = Int(100 * i / (Pic1.Image.Height - 2)).ToString & "%"
                    ProgressBar1.Value = Int(100 * i / (Pic1.Image.Height - 2))
                    Pic1.Refresh()
                End If
            Next
        End With
        ProgressBar1.Hide()
        Pic2.Refresh()
        Me.Text = "Proses Smoothing Image berhasil"
    End Sub

End Class

maka jalankanlah program tersebut, ehee jangan lupa pilih gambarnya dulu ya dari komputer anda .