vb.net 教程 5-13 图像处理之像素处理 4

清疚 2022-09-10 15:27 144阅读 0赞

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这一篇介绍的是仅有红色、绿色或者蓝色分量的特效：

仅红色时候：

RNew=R  
GNew=0  
BNew=0

仅绿色时候：

RNew=0

GNew=G

BNew=0

仅蓝色时候：

RNew=0  
GNew=0  
BNew=B

使用的时候代码如下：

'仅红色  
    Private Sub btnOnlyRed\_Click(sender As Object, e As EventArgs) Handles btnOnlyRed.Click  
        Dim pSourceColor As Color  
        Dim pDestColor As Color  
   
        Dim destImg As New Bitmap(sourceImg.Width, sourceImg.Height)  
        Dim R, G, B As Integer  
   
        For i As Integer = 0 To sourceImg.Width - 1  
            For j As Integer = 0 To sourceImg.Height - 1  
                pSourceColor = sourceImg.GetPixel(i, j)  
                R = pSourceColor.R  
                G = 0  
                B = 0  
                pDestColor = Color.FromArgb(R, G, B)  
                destImg.SetPixel(i, j, pDestColor)  
            Next  
        Next  
        picDest.Image = destImg  
    End Sub  
   
    '仅绿色  
    Private Sub btnOnlyGreen\_Click(sender As Object, e As EventArgs) Handles btnOnlyGreen.Click  
        Dim pSourceColor As Color  
        Dim pDestColor As Color  
   
        Dim destImg As New Bitmap(sourceImg.Width, sourceImg.Height)  
        Dim R, G, B As Integer  
   
        For i As Integer = 0 To sourceImg.Width - 1  
            For j As Integer = 0 To sourceImg.Height - 1  
                pSourceColor = sourceImg.GetPixel(i, j)  
                R = 0  
                G = pSourceColor.G  
                B = 0  
                pDestColor = Color.FromArgb(R, G, B)  
                destImg.SetPixel(i, j, pDestColor)  
            Next  
        Next  
        picDest.Image = destImg  
    End Sub  
   
    '仅蓝色  
    Private Sub btnOnlyBlue\_Click(sender As Object, e As EventArgs) Handles btnOnlyBlue.Click  
        Dim pSourceColor As Color  
        Dim pDestColor As Color  
   
        Dim destImg As New Bitmap(sourceImg.Width, sourceImg.Height)  
        Dim R, G, B As Integer  
   
        For i As Integer = 0 To sourceImg.Width - 1  
            For j As Integer = 0 To sourceImg.Height - 1  
                pSourceColor = sourceImg.GetPixel(i, j)  
                R = 0  
                G = 0  
                B = pSourceColor.B  
                pDestColor = Color.FromArgb(R, G, B)  
                destImg.SetPixel(i, j, pDestColor)  
            Next  
        Next  
        picDest.Image = destImg  
    End Sub  
运行时的效果如下：

由于.net平台下C\#和vb.NET很相似，本文也可以为C\#爱好者提供参考。

学习更多vb.net知识，请参看[vb.net教程][vb.net] 目录

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