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关于lockbits的使用，请看《vb.net 教程 5-14 图像处理之内存处理基础1》系列

 

 

 

图像处理之内存处理对应图像处理之像素处理，

 

具体的算法请参考《vb.net 教程 5-13 图像处理之像素处理1》，我把代码重新写到了使用LockBits。

 

 

 

红色通道：

 

 

 

    '红色通道

    'http://blog.csdn.net/uruseibest

    Private Sub btnRed_Click(sender As Object, e As EventArgs) Handles btnRed.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)

                rgbvalues(pos) = R

                rgbvalues(pos + 1) = R

                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

绿色通道：

 

    '绿色通道

    'http://blog.csdn.net/uruseibest

    Private Sub btnGreen_Click(sender As Object, e As EventArgs) Handles btnGreen.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)

                rgbvalues(pos) = G

                rgbvalues(pos + 1) = G

                rgbvalues(pos + 2) = G

 

                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

蓝色通道：

 

    '蓝色通道

    'http://blog.csdn.net/uruseibest

    Private Sub btnBlue_Click(sender As Object, e As EventArgs) Handles btnBlue.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)

                rgbvalues(pos) = B

                rgbvalues(pos + 1) = B

                rgbvalues(pos + 2) = B

 

                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

 

 

学习更多vb.net知识，请参看 vb.net 教程 目录

 

 

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原文链接：https://blog.csdn.net/uruseibest/article/details/70543843