我需要通过特殊的方式为照片添加水印.我知道如何做,但我不知道如何做到与第
http://www.photoshopessentials.com/photo-effects/copyright/条相同的方式
这里是添加水印的方法.我可以如何改变它以获得水印图像,如上面的文章？
public static Bitmap AddWatermark(this Bitmap originalImage,Bitmap watermarkImage,WatermarkLocationEnum location)
{
int offsetWidth;
int offsetHeight;
if ((watermarkImage.Width > originalImage.Width) | (watermarkImage.Height > originalImage.Height))
throw new Exception("The watermark must be smaller than the original image.");
Bitmap backgroundImage = new Bitmap((Bitmap)originalImage.Clone());
Bitmap image = new Bitmap(backgroundImage.Width,backgroundImage.Height);
Graphics graphics = Graphics.FromImage(image);
offsetWidth = GetOffsetWidth(image.Width,watermarkImage.Width,location);
offsetHeight = GetOffsetHeight(image.Height,watermarkImage.Height,location);
watermarkImage.SetResolution(backgroundImage.HorizontalResolution,backgroundImage.VerticalResolution);
offsetWidth = Math.Max(offsetWidth - 1,0);
offsetHeight = Math.Max(offsetHeight - 1,0);
graphics.DrawImage(watermarkImage,offsetWidth,offsetHeight);
for (int i = offsetWidth; i < (offsetWidth + watermarkImage.Width); i++)
{
for (int j = offsetHeight; j < (offsetHeight + watermarkImage.Height); j++)
{
Color pixel = image.GetPixel(i,j);
if (pixel.A > 0)
{
Color color = Color.FromArgb(pixel.A,pixel.R,pixel.G,pixel.B);
Color imagePixelColor = backgroundImage.GetPixel(i,j);
double alpha = (double)color.A / 255;
Color newColor = Color.FromArgb(255,(int)((double)imagePixelColor.R * (1.0 - alpha) + alpha * color.R),(int)((double)imagePixelColor.G * (1.0 - alpha) + alpha * color.G),(int)((double)imagePixelColor.B * (1.0 - alpha) + alpha * color.B));
backgroundImage.SetPixel(i,j,newColor);
}
}
}
return backgroundImage;
}
//............
Image img = Bitmap.FromFile("DSC00766.JPG");
var wtm = (Bitmap)Bitmap.FromFile("Copyright1.jpg");
((Bitmap)img).AddWatermark(wtm,WatermarkLocationEnum.BottomCenter).Save("new.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);
UPDATE
1附加结果
2附件结果
解决方法
如果您创建您的版权图像,使其是半透明的并且具有这样的透明背景(使用Paint.NET)：
您可以从中创建一个TextureBrush,并使用它来绘制原始图像的版权：
private void button2_Click(object sender,EventArgs e)
{
using (Image image = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Desert.jpg"))
using (Image watermarkImage = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\watermark.png"))
using (Graphics imageGraphics = Graphics.FromImage(image))
using (Brush watermarkBrush = new TextureBrush(watermarkImage))
{
imageGraphics.FillRectangle(watermarkBrush,new Rectangle(new Point(0,0),image.Size));
image.Save(@"C:\Users\Public\Pictures\Sample Pictures\Desert_watermark.jpg");
}
}
这产生了这个结果：
