Belajar Program: Aplikasi Gambar Pengolahan Citra Menggunakan VB Net

Berikut contoh program aplikasi untuk melakukan pengolahan citra :

1. Citra Grayscale
2. Citra Negatif
3. Citra Brigthness
4. Citra Biner
5. Citra Rotate 180 Derajat

Dilengkapi dengan menu Open dan Save citra yang akan dan telah di olah. Berikut design aplikasi sederhana pengolahan citra menggunakan VB Net

Tambahkan komponen menustrip (pada toolbox Menus & Toolbar), OpenFileDialog ( pada toolbox Dialog) dan SaveFileDialog (pada toolbox Dialog)

OpenFileDialog = name dirubah menjadi OFD

SaveFileDialog = name dirubah menjadi SFD

Listing Program

Public Class Form1
Dim gambar As Bitmap

Private Sub OFD_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.Image)

End Sub

Private Sub SFD_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 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 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

Private Sub BrigthnessToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BrigthnessToolStripMenuItem.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 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 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 DefaultGambarToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DefaultGambarToolStripMenuItem.Click
gambar = New Bitmap(Pic1.Image)
End Sub
End Class

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