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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
當我單擊按鈕時,什麼都沒有發生。我在這裏做錯了什麼?在更改圖像不透明度時遇到問題
您可能希望將標題更改爲更具體的問題,網站上的每個問題都可能出現在您當前的標題下 – 2011-02-10 11:28:31
您預期會發生什麼? bmpPic.Image是一個實際的,實例化的對象嗎? – 2011-02-10 11:30:22