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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 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。
