彩色图像转黑白图像

Question

大哥们:
    小弟在往位图里绘制文字时，发现画上去的文字边缘有灰色成份，这样我如果生成一张黑白图像的话，文字就不饱满了。请问该如何解决这个问题。

Answer 1

//-下面函数 往图片上加字 private string overlay(string imgSrc1,int imgLeft1,int imgTop1,string strFont1,string strSize1,string strColor1,string strText1,double cur_width,double cur_height)
{
//Response.Write("<script>alert('"+strColor1+"');</script>");
//int lenImage1=imgSrc1.Length-4;
DateTime now1=DateTime.Now;
string RD=now1.ToString("yyyyMMddHHmmss");
string imgPath=imgSrc1.Substring(imgSrc1.IndexOf("/upimages/")+10);;
//imgPath=imgPath.Substring(imgPath.IndexOf('/')+1);
//imgPath=imgPath.Substring(imgPath.IndexOf('/')+1);
imgPath=imgPath.Substring(0,imgPath.LastIndexOf('/')+1);
string imgName=imgSrc1.Substring(imgSrc1.LastIndexOf('/')+1);
string subGet=imgSrc1.Substring(imgSrc1.LastIndexOf('.'));
string sd=Session.SessionID.ToString();
string newImgSrc="";
newImgSrc=Server.MapPath("upimages\\diytemp\\")+sd+RD+RD+subGet;

string tempPath=Server.MapPath("upimages/"+imgPath)+imgName; double imageWidth=0;
double imageHigh=0; //取图片像素
System.Drawing.Image oldImage=System.Drawing.Image.FromFile(tempPath);
//根据比例 缩小
imageWidth=cur_width;
imageHigh =cur_height;
// 生成缩微图 .JPG！
System.Drawing.Image thumbnailImage =oldImage.GetThumbnailImage((int)imageWidth,(int)imageHigh,new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
Bitmap output=new Bitmap(thumbnailImage);
//存储类型
output.Save(newImgSrc,System.Drawing.Imaging.ImageFormat.Jpeg);
//释放资源
output.Dispose();
oldImage.Dispose();
thumbnailImage.Dispose();
//RenderImage(imgSrc1,strText1,newImgSrc);
System.Drawing.Image oldImage1=System.Drawing.Image.FromFile(newImgSrc);
Bitmap myBitmap1 = new Bitmap(oldImage1);
Graphics g = Graphics.FromImage(myBitmap1); Font aFont=new Font(strFont1,(float)(int.Parse(strSize1)),System.Drawing.GraphicsUnit.Point);
Brush aBrush=new SolidBrush(System.Drawing.ColorTranslator.FromHtml(strColor1));
g.DrawString(strText1,aFont,aBrush,imgLeft1,imgTop1,System.Drawing.StringFormat.GenericTypographic);
//g.DrawString(strText1,aFont,System.Drawing.Brushes.Blue,rec);
newImgSrc=Server.MapPath("upimages\\diytemp\\")+sd+RD+subGet;
myBitmap1.Save(newImgSrc,System.Drawing.Imaging.ImageFormat.Jpeg);
// 清除缓冲 
//Response.Clear();
aFont.Dispose();
oldImage1.Dispose();
myBitmap1.Dispose();
g.Dispose(); txtlenImage+=1;
txttimeImage=RD; string imgsrc="upimages/diytemp/"+sd+RD+subGet;
return imgsrc;
}

Answer 2

TO csShooter(Sharp Shooter)大哥:
取消字体边沿自动处理，这个什么地方可以设定吗？