Resize af billeder -- hjælp til bedre kvalitet

Hej!

Jeg anvender nedenstående C# kode sammen med noget gammel klassisk ASP kode til resize af billeder, men da kvaliteten af scaleringen er ringe (og "qQuality" variablen i koden er ikke meget anvendelig), ville jeg høre om der var en venlig sjæl der kunne være behjælpelig med at få implementeret følgende funktoner:

CompositingMode = CompositingMode.SourceCopy;
CompositingQuality = CompositingQuality.HighQuality;
SmoothingMode = SmoothingMode.HighQuality;
InterpolationMode = InterpolationMode.HighQualityBicubic;

Har prøvet et hav af gange nu, desværre uden resultat! :(

På forhånd tak for hjælpen!


Kode:

<%@ Page Language="C#"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<script runat="server">

    void Page_Load(Object s, EventArgs e) {
       
        int intNewWidth,intNewHeight, maxWidth = 800, maxHeight = 600, qQuality = 75;
    if ( Request["w"] != null) maxWidth = int.Parse(Request["w"]);
    if ( Request["h"] != null) maxHeight = int.Parse(Request["h"]);
    if ( Request["q"] != null) qQuality = int.Parse(Request["q"]);
       
        //get image from parameter
        string pictureFileName = Request["f"];
    string newFileName = Request["nf"];
    if (pictureFileName == null || pictureFileName == "" || !System.IO.File.Exists(pictureFileName)) {
      Response.Write("Error: File (" + pictureFileName + ") not found or empty"); 
      return;
    }
        System.Drawing.Image inputImage = System.Drawing.Image.FromFile(pictureFileName);
       
    //define size for new image
        string aspect = Request["a"];
        if (aspect == "true") {
            if (maxWidth < inputImage.Width || maxHeight < inputImage.Height) {
                if (maxWidth >= maxHeight) {
                    intNewWidth = (int)((double)maxHeight*((double)inputImage.Width/(double)inputImage.Height));
                    intNewHeight = maxHeight;
                } else {
                    intNewWidth = maxWidth;
                    intNewHeight = (int)((double)maxWidth*((double)inputImage.Height/(double)inputImage.Width));
                }
                if (intNewWidth > maxWidth) {
                    intNewWidth = maxWidth;
                    intNewHeight = (int)((double)maxWidth*((double)inputImage.Height/(double)inputImage.Width));
                }
                if (intNewHeight > maxHeight) {
                    intNewWidth = (int)((double)maxHeight*((double)inputImage.Width/(double)inputImage.Height));
                    intNewHeight = maxHeight;
                }
            } else {
                intNewWidth = inputImage.Width;
                intNewHeight = inputImage.Height;
            }
        } else {
                intNewWidth = maxWidth;
                intNewHeight = maxHeight;
        }

    try {       
      //output new image with different size
          Bitmap outputBitMap = new Bitmap(inputImage,intNewWidth,intNewHeight);
      inputImage.Dispose();

        EncoderParameters eps = new System.Drawing.Imaging.EncoderParameters(1);
        eps.Param[0] = new System.Drawing.Imaging.EncoderParameter( System.Drawing.Imaging.Encoder.Quality, qQuality );
       
        ImageCodecInfo ici = GetEncoderInfo("image/jpeg");
      if (pictureFileName.ToLower() == newFileName.ToLower())
        System.IO.File.Delete(pictureFileName);
      outputBitMap.Save(newFileName, ici, eps);
      outputBitMap.Dispose();     
    }       
    catch (Exception ex) {
        Response.Write("Error: " + ex);
            return;
    } 
   
    Response.Write(intNewWidth + ";" + intNewHeight + ";" + "DONE");
  }
   
  private static ImageCodecInfo GetEncoderInfo(String mimeType) {
    int j;
    ImageCodecInfo[] encoders;
    encoders = ImageCodecInfo.GetImageEncoders();
    for(j = 0; j < encoders.Length; ++j) {
      if(encoders[j].MimeType == mimeType)
        return encoders[j];
    }
    return null;
  }
   
</script>