vb.net 教程 5-16 图像处理之ImageAttributes 类2 颜色矩阵3

继续上一节的讲解，看看之前 《vb.net 教程 5-16 图像处理之ImageAttributes 类1 颜色矩阵1》中讲到的其他几个特殊矩阵的使用。

    '仅绿色分量
    Private Sub Button11_Click(sender As Object,e As EventArgs) Handles Button11.Click
        Dim imageAttributes As New ImageAttributes()
        '仅绿色分量
        Dim imgMatrixElement()() As Single = {
          New Single() {0,0},New Single() {0,1,0}
        }

        Dim imgMatrix As New ColorMatrix(imgMatrixElement)
        imageAttributes.SetColorMatrix(imgMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap)

        Dim destImg As New Bitmap(sourceImg.Width,sourceImg.Height)
        Dim g As Graphics = Graphics.FromImage(destImg)
        g.DrawImage(sourceImg,New Rectangle(0,sourceImg.Width,sourceImg.Height),sourceImg.Height,GraphicsUnit.Pixel,imageAttributes)

        picDest.Image = destImg
    End Sub

    '仅蓝色分量
    Private Sub Button12_Click(sender As Object,e As EventArgs) Handles Button12.Click
        Dim imageAttributes As New ImageAttributes()
        '仅蓝色分量
        Dim imgMatrixElement()() As Single = {
          New Single() {0,imageAttributes)

        picDest.Image = destImg
    End Sub

    '灰度：指数加权法
    Private Sub Button13_Click(sender As Object,e As EventArgs) Handles Button13.Click
        Dim imageAttributes As New ImageAttributes()
        '灰度
        Dim imgMatrixElement()() As Single = {
          New Single() {0.3,0.3,New Single() {0.59,0.59,New Single() {0.11,0.11,imageAttributes)

        picDest.Image = destImg
    End Sub

    '逆反
    Private Sub Button14_Click(sender As Object,e As EventArgs) Handles Button14.Click
        Dim imageAttributes As New ImageAttributes()
        '逆反
        Dim imgMatrixElement()() As Single = {
          New Single() {-1,-1,New Single() {1,imageAttributes)

        picDest.Image = destImg
    End Sub

传入的矩阵不同，输出图像的颜色不同。

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 目录

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