您所在位置：主题：[原创]简单实用的给图片加水印源代码
一江秋水
[专家分：9680] 发布于 2010-11-22 18:17:00
在窗体上添加3个图片框，它们的ScaleMode属性都设为3，AutoRedraw属性都设为True，其中Picture1加载背景图像，Size要大一点，水印也将要加在这上面；Picture2加载水印图像，Size要小一点；Picture3打印水印文字。
再添加2个按纽，点击Command1时，就把Picture2上的图像加到Picture1上，点击Command2时，则把Picture3上的文字加到Picture1上。
水印可调节透明度，其值在10-90之间选择，此值越大越透明。
文字颜色、字体、以及水印位置都可自由设置。
你可以只加图像水印或只加文字水印，也可两者都加。
代码较简单，不多说了。
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 '背景图取点坐标
Dim color 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
color = GetPixel(Picture2.hdc, x1, y1) '从水印图像取点
r1 = color Mod 256
g1 = color \ 256 Mod 256
b1 = color \ 256 \ 256
color = GetPixel(Picture1.hdc, x2, y2) '从背景图像取点
r2 = color Mod 256
g2 = color \ 256 Mod 256
b2 = color \ 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 '背景图取点坐标
Dim color 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"
Picture3.Width = Picture3.TextWidth(st) * 15 + 60
Picture3.Height = Picture3.TextHeight(st) * 15 + 60
Picture3.ForeColor = vbWhite
Picture3.FontSize = 14
Picture3.FontBold = True
Picture3.Cls
Picture3.Print st
Picture3.Refresh
For y1 = 0 To Picture3.ScaleHeight - 1
x2 = (Picture1.Width - Picture3.Width) / 15 - 20
For x1 = 0 To Picture3.ScaleWidth - 1
color = GetPixel(Picture3.hdc, x1, y1) '从水印字符图取点
If color = vbWhite Then
r1 = color Mod 256
g1 = color \ 256 Mod 256
b1 = color \ 256 \ 256
color = GetPixel(Picture1.hdc, x2, y2) '从背景图像取点
r2 = color Mod 256
g2 = color \ 256 Mod 256
b2 = color \ 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
再添加2个按纽，点击Command1时，就把Picture2上的图像加到Picture1上，点击Command2时，则把Picture3上的文字加到Picture1上。
水印可调节透明度，其值在10-90之间选择，此值越大越透明。
文字颜色、字体、以及水印位置都可自由设置。
你可以只加图像水印或只加文字水印，也可两者都加。
代码较简单，不多说了。
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 '背景图取点坐标
Dim color 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
color = GetPixel(Picture2.hdc, x1, y1) '从水印图像取点
r1 = color Mod 256
g1 = color \ 256 Mod 256
b1 = color \ 256 \ 256
color = GetPixel(Picture1.hdc, x2, y2) '从背景图像取点
r2 = color Mod 256
g2 = color \ 256 Mod 256
b2 = color \ 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 '背景图取点坐标
Dim color 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"
Picture3.Width = Picture3.TextWidth(st) * 15 + 60
Picture3.Height = Picture3.TextHeight(st) * 15 + 60
Picture3.ForeColor = vbWhite
Picture3.FontSize = 14
Picture3.FontBold = True
Picture3.Cls
Picture3.Print st
Picture3.Refresh
For y1 = 0 To Picture3.ScaleHeight - 1
x2 = (Picture1.Width - Picture3.Width) / 15 - 20
For x1 = 0 To Picture3.ScaleWidth - 1
color = GetPixel(Picture3.hdc, x1, y1) '从水印字符图取点
If color = vbWhite Then
r1 = color Mod 256
g1 = color \ 256 Mod 256
b1 = color \ 256 \ 256
color = GetPixel(Picture1.hdc, x2, y2) '从背景图像取点
r2 = color Mod 256
g2 = color \ 256 Mod 256
b2 = color \ 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
