大家好,我试图通过使用蒙版使我的图像看起来漂亮和平滑(抗锯齿),以便制作如下所示的圆形图像:

原始图像如下所示:

上图的 mask 看起来像这样(红色是要取出的 mask 颜色):

它有效,但它给了我周围那些不太好的锯齿状边缘。掩码是 .png,图像本身也是 .png。

我用来制作面具的代码是这样的:

picNextTopic1.Image = Image.FromStream(wc.OpenRead(anAPI.wallOrgPostImage(keying).Replace("{width}", "50").Replace("{height}", "50"))) 'Download the image from the website.
picNextTopic1.Image = ApplyMask(New Bitmap(picNextTopic1.Image), New Bitmap(My.Resources.mask), Color.Red) 'Apply mask to the downloaded image above.

ApplyMask 函数是这样的:
Public Function ApplyMask(ByVal bImg As Bitmap, ByVal bMask As Bitmap, ByVal maskColor As Color) As Image
    Dim wImg As Integer = bImg.Width
    Dim hImg As Integer = bImg.Height
    Dim wMask As Integer = bMask.Width
    Dim hMask As Integer = bMask.Height
    Dim intMask As Integer = maskColor.ToArgb
    Dim intTransparent As Integer = Color.Transparent.ToArgb

    Using fpImg As New FastPix(bImg)
        Using fpMask As New FastPix(bMask)
            Dim pixelsImg = fpImg.PixelArray
            Dim pixelsMask = fpMask.PixelArray

            For y As Integer = 0 To Math.Min(hImg, hMask) - 1
                For x As Integer = 0 To Math.Min(wImg, wMask) - 1
                    Dim iImg As Integer = (y * wImg) + x
                    Dim iMask As Integer = (y * wMask) + x

                    If pixelsMask(iMask) = intMask Then
                        pixelsImg(iImg) = intTransparent
                    End If
                Next
            Next
        End Using
    End Using

    Return bImg
End Function

其中使用 FastPix 发现 here

任何帮助解决这个问题都会很棒!谢谢!

更新
我拥有的透明表单代码:
Public Sub InitializeMyForm()
    BackColor = Color.Plum
    TransparencyKey = BackColor
End Sub

最佳答案

玩弄这个,我确实设法使用 TextureBrush 以这种方式制作了一个平滑的图像:

Dim profile As Image = Image.FromFile("c:\...\profile.png")

Protected Overrides Sub OnPaint(e As PaintEventArgs)
  e.Graphics.Clear(Color.SteelBlue)
  e.Graphics.SmoothingMode = SmoothingMode.AntiAlias
  Using tb As New TextureBrush(profile)
    tb.TranslateTransform(120, 64)
    Using p As New GraphicsPath
      p.AddEllipse(120, 64, profile.Width, profile.Width)
      e.Graphics.FillPath(tb, p)
    End Using
  End Using
  MyBase.OnPaint(e)
End Sub

TranslateTransform 和 AddEllipse 位置使用相同的点信息以适本地“居中”纹理画笔。

结果:

关于使边缘平滑的 Vb.net 图像蒙版,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/20661126/

10-11 22:26
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