GDI+ text looks bad

I have written a "textimage.aspx" page that returns an image/jpeg formatted according to the following parameters:
text string, font name, font size, font color, back color
The output usually looks fine but when using certain colors a degraded quality becomes apparent. (see http://beta.s3m.net/gdi_test.jpg)
I really need to figure out how to improve the quality... any change that would move me closer to the photoshop/fireworks-rendered text would be very helpful.

Here is the code, stripped down to the necessary parts:

////////////////////

Response.Clear();
Response.ContentType = "image/jpeg";

Bitmap myBmp = TextToImage(str,fName,fSize,fColor,bColor,trim);
EncoderParameters eps = new EncoderParameters(1);
eps.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
ImageCodecInfo[] objEncoders = ImageCodecInfo.GetImageDecoders();

for(int i=0;i<objEncoders.Length;i++)
{
      if(objEncoders[i].MimeType==Response.ContentType)
      {
            myBmp.Save(Response.OutputStream,objEncoders[i],eps);
            myBmp.Dispose();
            break;
      }
}

private Bitmap CreateImage(strText, strFontName, intFontSize, strForeColor, strBackColor)
{
      Color clrForeColor = ColorTranslator.FromHtml("#"+strForeColor);
      Color clrBackColor = ColorTranslator.FromHtml("#"+strBackColor);                  

      //get font path from DB of custom fonts

      PrivateFontCollection pfc = new PrivateFontCollection();
      pfc.AddFontFile(strFontPath);

      FontStyle myStyle = FontStyle.Regular;
      if(strFontName.ToLower().IndexOf("bold")>-1){myStyle = FontStyle.Bold;}
      if(strFontName.ToLower().IndexOf("italic")>-1){myStyle = FontStyle.Italic;}

      Font font=new Font(new FontFamily(strFontName,pfc),intFontSize, myStyle);

      Bitmap bmp = new Bitmap(1, 1, PixelFormat.Format24bppRgb);
      Graphics g = Graphics.FromImage(bmp);

      SizeF imageSize = g.MeasureString(strText,font);
      int intWidth = (int)imageSize.Width;
      int intHeight = (int)imageSize.Height;

      bmp = new Bitmap(intWidth, intHeight, PixelFormat.Format24bppRgb);
      g = Graphics.FromImage(bmp);
      g.Clear(clrBackColor);
      g.TextRenderingHint = TextRenderingHint.AntiAlias;
      g.DrawString(strText, font, new SolidBrush(clrForeColor),new PointF(0,0));
      g.CompositingQuality = CompositingQuality.HighQuality;
      pfc.Dispose();                  
      g.Flush();
      g.Dispose();
                  
      return bmp;
}