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  • vb.net 教程 5-15 图像处理之内存处理 4

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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 4 》
 
仅红色：
 
 
 
    '仅红色
    'http://blog.csdn.net/uruseibest
    Private Sub btnOnlyRed_Click(sender As Object, e As EventArgs) Handles btnOnlyRed.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 = 0
                G = 0
                R = 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
 
 
 
 
 
 
 
 
 
 
仅绿色：
 
 
 
    '仅绿色
    'http://blog.csdn.net/uruseibest
    Private Sub btnOnlyGreen_Click(sender As Object, e As EventArgs) Handles btnOnlyGreen.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 = 0
                G = rgbvalues(pos + 1)
                R = 0
                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
仅蓝色：
 
 
 
 
 
 
 
    '仅蓝色
    'http://blog.csdn.net/uruseibest
    Private Sub btnOnlyBlue_Click(sender As Object, e As EventArgs) Handles btnOnlyBlue.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 = 0
                R = 0
                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
 
 
学习更多vb.net知识，请参看 vb.net 教程 目录
 
 
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版权声明：本文为CSDN博主「VB.Net」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/uruseibest/article/details/70543989

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