createimg.aspx.cs

.net GDI+ 图片生成黑白效果

using System;
using System.Drawing;
using System.Drawing.Imaging;

public partial class createimg : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    public void Oldimg(string spath, string npath)
    {
        Bitmap currentBitmap = new Bitmap(spath);
        Graphics g = Graphics.FromImage(currentBitmap);

        #region 调整颜色矩阵
        ImageAttributes ia = new ImageAttributes();
        
        //黑白
        float[][] colorMatrix =   {     
        new   float[]   {0.3F, 0.3F, 0.3F, 0, 0},                 
        new   float[]   {0.59F, 0.59F, 0.59F, 0, 0},                 
        new   float[]   {0.11F, 0.11F, 0.11F, 0, 0},             
        new   float[]   {0, 0, 0, 1, 0},                   
        new   float[]   {0, 0, 0, 0, 1}};
        ColorMatrix cm = new ColorMatrix(colorMatrix);
        ia.SetColorMatrix(cm, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
        g.DrawImage(currentBitmap, new Rectangle(0, 0, currentBitmap.Width, currentBitmap.Height), 0, 0, currentBitmap.Width, currentBitmap.Height, GraphicsUnit.Pixel, ia);
        #endregion 调整颜色矩阵

        //浮雕
        //currentBitmap = GetImageLine(currentBitmap);
        currentBitmap.Save(npath, ImageFormat.Jpeg);
        g.Dispose();
    }
}