vb.net 教程 5-15 图像处理之内存处理2- VB

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具体算法请参看《 vb.net 教程 5-13 图像处理之像素处理 2》

逆反：

'逆反
'http://blog.csdn.net/uruseibest
Private Sub btnInversion_Click(sender As Object, e As EventArgs) Handles btnInversion.Click
Dim destImg As New Bitmap(sourceImg.Width, sourceImg.Height)
Dim sourceData As BitmapData = sourceImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb)
Dim destData As BitmapData = destImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb)

Dim pSource As IntPtr = sourceData.Scan0
Dim allBytes As Integer = sourceData.Stride * sourceData.Height
Dim rgbvalues() As Byte
ReDim rgbvalues(allBytes - 1)
Marshal.Copy(pSource, rgbvalues, 0, allBytes)

Dim pos As Integer = 0
Dim R, G, B As Integer

For j As Integer = 0 To sourceData.Height - 1
For i As Integer = 0 To sourceData.Width - 1
B = 255 - rgbvalues(pos)
G = 255 - rgbvalues(pos + 1)
R = 255 - rgbvalues(pos + 2)
rgbvalues(pos) = B
rgbvalues(pos + 1) = G
rgbvalues(pos + 2) = R

pos = pos + 3
Next
pos = pos + sourceData.Stride - sourceData.Width * 3
Next

Dim pDest As IntPtr = destData.Scan0
Marshal.Copy(rgbvalues, 0, pDest, allBytes)

sourceImg.UnlockBits(sourceData)
destImg.UnlockBits(destData)

picDest.Image = destImg
End Sub
曝光：

'曝光
'http://blog.csdn.net/uruseibest
Private Sub btnExposure_Click(sender As Object, e As EventArgs) Handles btnExposure.Click
Dim destImg As New Bitmap(sourceImg.Width, sourceImg.Height)
Dim sourceData As BitmapData = sourceImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb)
Dim destData As BitmapData = destImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb)

Dim pSource As IntPtr = sourceData.Scan0
Dim allBytes As Integer = sourceData.Stride * sourceData.Height
Dim rgbvalues() As Byte
ReDim rgbvalues(allBytes - 1)
Marshal.Copy(pSource, rgbvalues, 0, allBytes)

Dim pos As Integer = 0
Dim R, G, B As Integer

For j As Integer = 0 To sourceData.Height - 1
For i As Integer = 0 To sourceData.Width - 1
B = rgbvalues(pos)
G = rgbvalues(pos + 1)
R = rgbvalues(pos + 2)
If R < 128 Then R = 255 - R
If G < 128 Then G = 255 - G
If B < 128 Then B = 255 - B

rgbvalues(pos) = B
rgbvalues(pos + 1) = G
rgbvalues(pos + 2) = R
pos = pos + 3
Next
pos = pos + sourceData.Stride - sourceData.Width * 3
Next

Dim pDest As IntPtr = destData.Scan0
Marshal.Copy(rgbvalues, 0, pDest, allBytes)

sourceImg.UnlockBits(sourceData)
destImg.UnlockBits(destData)

picDest.Image = destImg
End Sub