简单实用的给图片加水印源代码[VB]

Private Declare Function SetPixelV Lib "gdi32" (ByVal hdc As Long, ByVal x
As Long, ByVal y As Long, ByVal crColor As Long) As Long
Private Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As
Long, ByVal y As Long) As Long

Private Sub Command1_Click()     '加水印图像
Dim transparence As Integer      '水印透明度
Dim x1 As Integer, y1 As Integer '水印图取点坐标
Dim x2 As Integer, y2 As Integer '背景图上的水印位置坐标
Dim c As Long
Dim r1 As Integer, g1 As Integer, b1 As Integer
Dim r2 As Integer, g2 As Integer, b2 As Integer

transparence = 50                '此值在 10-90 之间，越大越透明
y2 = (Picture1.Height - Picture2.Height) / 15 - 20

For y1 = 0 To Picture2.ScaleHeight - 1
  x2 = (Picture1.Width - Picture2.Width) / 15 - 20
  For x1 = 0 To Picture2.ScaleWidth - 1

    c = GetPixel(Picture2.hdc, x1, y1) '从水印图像取点
    r1 = c Mod 256
    g1 = c \ 256 Mod 256
    b1 = c \ 256 \ 256

    c = GetPixel(Picture1.hdc, x2, y2) '从背景图像取点
    r2 = c Mod 256
    g2 = c \ 256 Mod 256
    b2 = c \ 256 \ 256

    r1 = r1 - transparence * (r1 - r2) / 100
    g1 = g1 - transparence * (g1 - g2) / 100
    b1 = b1 - transparence * (b1 - b2) / 100

    SetPixelV Picture1.hdc, x2, y2, RGB(r1, g1, b1)
    x2 = x2 + 1
  Next
  y2 = y2 + 1
Next

Picture1.Refresh
End Sub


Private Sub Command2_Click()     '加水印字符
Dim transparence As Integer      '水印透明度
Dim x1 As Integer, y1 As Integer '水印字符图取点坐标
Dim x2 As Integer, y2 As Integer '背景图上的水印位置坐标
Dim c1 As Long, c2 As Long
Dim r1 As Integer, g1 As Integer, b1 As Integer
Dim r2 As Integer, g2 As Integer, b2 As Integer
Dim st As String

transparence = 50
y2 = (Picture1.Height - Picture3.Height) / 15 - 20
st = "编程爱好者" '水印文字
c2 = vbWhite      '文字颜色

With Picture3
  .FontSize = 14
  .FontBold = True
  .ForeColor = c2
  .Width = .TextWidth(st) * 15 + 60
  .Height = .TextHeight(st) * 15 + 60
  .Cls
  Picture3.Print st
  .Refresh
With

For y1 = 0 To Picture3.ScaleHeight - 1
  x2 = (Picture1.Width - Picture3.Width) / 15 - 20
  For x1 = 0 To Picture3.ScaleWidth - 1
    c1 = GetPixel(Picture3.hdc, x1, y1) '从水印字符图取点
    If c1 = c2 Then
      r1 = c1 Mod 256
      g1 = c1 \ 256 Mod 256
      b1 = c1 \ 256 \ 256

      c1 = GetPixel(Picture1.hdc, x2, y2) '从背景图像取点
      r2 = c1 Mod 256
      g2 = c1 \ 256 Mod 256
      b2 = c1 \ 256 \ 256

      r1 = r1 - transparence * (r1 - r2) / 100
      g1 = g1 - transparence * (g1 - g2) / 100
      b1 = b1 - transparence * (b1 - b2) / 100

      SetPixelV Picture1.hdc, x2, y2, RGB(r1, g1, b1)
    End If
    x2 = x2 + 1
  Next
  y2 = y2 + 1
Next

Picture1.Refresh
End Sub