怎么把一个.bmp的位图白色背景作成透明的?
如题
bitmap1 = PictureBox1.Image
xres = PictureBox1.Size.Width
yres = PictureBox1.Size.Height
For i = 0 To xres - 1
For j = 0 To yres - 1
color1 = bitmap1.GetPixel(i, j)
a = color1.A
b = color1.B
r = color1.R
g = color1.G
inpic(i, j) = d
col = Color.FromArgb(0, r, g, b)
bitmap1.SetPixel(i, j, col)
Next
PictureBox1.Refresh()
Next
我用这种方法做但是没有用,请问你们是怎么做的呀?