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/// <summary>
/// 在图片上添加图片水印
/// </summary>
/// <param name="path">原服务器上的图片路径</param>
/// <param name="syPicPath">水印图片的路径 80透明</param>
/// <param name="waterPicPath">生成的水印图片存放路径</param>
public void AddWaterPic(string path, string syPicPath, string waterPicPath)
{
using (Image img = Image.FromFile(path))
{
//如果原图片是索引像素格式之列的,则需要转换
if (IsPixelFormatIndexed(img.PixelFormat))
{
Bitmap bmp = new Bitmap(img.Width, img.Height, PixelFormat.Format32bppArgb);
using (Graphics g = Graphics.FromImage(bmp))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.DrawImage(img, 0, 0);
}
//下面的水印操作,就直接对 bmp 进行了
System.Drawing.Image waterImage = System.Drawing.Image.FromFile(syPicPath);
System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(bmp);
using (ImageAttributes imgAttrib = ImageAttrib(80f))
{
graphic.DrawImage(waterImage, new System.Drawing.Rectangle(img.Width - waterImage.Width, img.Height - waterImage.Height, waterImage.Width, waterImage.Height), 0, 0, waterImage.Width, waterImage.Height, GraphicsUnit.Pixel, imgAttrib);
}
graphic.Dispose();
img.Save(waterPicPath);
img.Dispose();
}
else //否则直接操作
{
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
System.Drawing.Image waterImage = System.Drawing.Image.FromFile(syPicPath);
System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(image);
using (ImageAttributes imgAttrib = ImageAttrib(80f))
{
graphic.DrawImage(waterImage, new System.Drawing.Rectangle(image.Width - waterImage.Width, image.Height - waterImage.Height, waterImage.Width, waterImage.Height), 0, 0, waterImage.Width, waterImage.Height, GraphicsUnit.Pixel, imgAttrib);
}
graphic.Dispose();
image.Save(waterPicPath);
image.Dispose();
}
}
}