C#水印

 1        base.Response.ContentType = "image/jpeg";
 2        Bitmap image = new Bitmap(Server.MapPath("2008-12-31.jpg"));
 3        Bitmap waterImage = new Bitmap(Server.MapPath("74.png"));
 4
 5        Graphics graphics = Graphics.FromImage(image);
 6        graphics.InterpolationMode = InterpolationMode.High;
 7        graphics.SmoothingMode = SmoothingMode.HighQuality;
 8        ImageAttributes imageatta = new ImageAttributes();
 9        ColorMap colorMap = new ColorMap();
10        colorMap.OldColor = Color.FromArgb(225, 0, 225, 0);
11        colorMap.NewColor = Color.FromArgb(0, 222, 0, 0);
12        ColorMap[] RemapTable = { colorMap };
13        //imageatta.SetRemapTable(RemapTable, ColorAdjustType.Bitmap);
14        float[][] colorMatrixElm = {
15            new float[] {1, 0, 0, 0, 0},
16            new float[] {0, 1, 0, 0, 0},
17            new float[] {0, 0, 1, 0, 0},
18            new float[] {0, 0, 0, 0.5f, 0}, 
19            new float[] {0, 0, 0, 0, 1}
20        };
21        ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElm);
22        imageatta.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
23        int yPos = 0;
24        int xPos = 0;
25        graphics.DrawImage(waterImage, new Rectangle(xPos, yPos, waterImage.Width, waterImage.Height), 0, 0, waterImage.Width, waterImage.Height, GraphicsUnit.Pixel, imageatta);
26        graphics.Dispose();
27        image.Save(base.Response.OutputStream, ImageFormat.Jpeg);
28        image.Dispose();
29        waterImage.Dispose();

 

转载于:https://www.cnblogs.com/byxxw/archive/2008/12/16/1355848.html