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Imports System.Drawing.Imaging
Public Class Form1
Public Shared Function SetImgOpacity(ByVal imgPic As Image, ByVal imgOpac As Single) As Image
Dim bmpPic As New Bitmap(imgPic.Width, imgPic.Height)
Dim gfxPic As Graphics = Graphics.FromImage(bmpPic)
Dim cmxPic As New ColorMatrix()
Dim iaPic As New ImageAttributes()
cmxPic.Matrix33 = imgOpac
iaPic.SetColorMatrix(cmxPic, ColorMatrixFlag.[Default], ColorAdjustType.Bitmap)
gfxPic.DrawImage(imgPic, New Rectangle(0, 0, bmpPic.Width, bmpPic.Height), 0, 0, imgPic.Width, imgPic.Height, GraphicsUnit.Pixel, iaPic)
gfxPic.Dispose()
iaPic.Dispose()
Return bmpPic
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim a As Image = bmpPic.Image
SetImgOpacity(a, 50)
End Sub
End Class
当我单击按钮时,什么都没有发生。我在这里做错了什么?在更改图像不透明度时遇到问题
您可能希望将标题更改为更具体的问题,网站上的每个问题都可能出现在您当前的标题下 – 2011-02-10 11:28:31
您预期会发生什么? bmpPic.Image是一个实际的,实例化的对象吗? – 2011-02-10 11:30:22