I am using Dashcommerce for an e-commerce site and need to know how to create good looking thumbnails.

Any tips on how to do it in DashCommerce?

if your using 3.0 make them 150x150, if you use fireworks , you can batch process sometime betters to reduce size by %

2nd image on product page works at 300 to 400 wide.

You could create an Image Service.

 private Bitmap resize(Stream SourceImage, int MaxWidth, int MaxHeight)
    {
        Bitmap b = null;

        using (Image i = Image.FromStream(SourceImage))
        {
            int _maxWidth = (MaxWidth > 0) ? MaxWidth : i.Width;
            int _maxHeight = (MaxHeight > 0) ? MaxHeight : i.Height;
            double _scaleWidth = (double)_maxWidth / (double)i.Width;
            double _scaleHeight = (double)_maxHeight / (double)i.Height;
            double _scale = (_scaleHeight < _scaleWidth) ? _scaleHeight : _scaleWidth;
            _scale = (_scale > 1) ? 1 : _scale;

            int _newWidth = (int)(_scale * i.Width);
            int _newHeight = (int)(_scale * i.Height);

            b = new Bitmap(_newWidth, _newHeight);

            using (Graphics g = Graphics.FromImage(b))
            {
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(i, new Rectangle(0, 0, _newWidth, _newHeight));
                g.Save();
            }
        }
        return b;
    }

Something like this, get an image, modify it safe it to a stream or return it.

Thanks! Where do I put this code in ie ProductSummaryDisplay.ascx.cs, and how do I call the function to show the images in ProductSummaryDisplay.ascx?

Create a new generic Handler in Visual Studio.

This is the Code For it:

<%@ WebHandler Language="C#" Class="ImageService" %>

using System;
using System.Web;
using Commerce.CaptchaImage;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Net;
using System.IO;

namespace SitesBytes.ImageHandler{

public class ImageService : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        if (context.Request["r"] != null)
            ImageResize(context);
       
    }

    public void ImageResize(HttpContext context )
    {
        Image sourceImage = GetImageFromURL(/*PUT YOUR DOMAIN HERE*/ + context.Request["src"]);
       
        double width = (context.Request["width"] != null) ? Convert.ToInt32(context.Request["width"]) : 100;

        double sizeFactor = width / sourceImage.Width;
        double newHeigth = sizeFactor * sourceImage.Height;
        Bitmap newImage = new Bitmap((int)width, (int)newHeigth);
        using (Graphics g = Graphics.FromImage(newImage))
        {
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.DrawImage(sourceImage, new Rectangle(0, 0, (int)width, (int)newHeigth));
        }
        newImage.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
    }
    private static Image GetImageFromURL(string url)
    {
        HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
        HttpWebResponse httpWebReponse = (HttpWebResponse)httpWebRequest.GetResponse();
        Stream stream = httpWebReponse.GetResponseStream();
        return Image.FromStream(stream);

    }
   

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}
}

The URL to Call the handler is:

<img src="~/Imagehandler.ashx?r=~/images/test.jpg&w=200" alt="something" />

That means the Image is in domain.com/images/test.jpg
The resized width is 200

Didnt have the time to test it right now, but it should work.

Cheers

Timmey

Thank you!

I will test it out, if it works you are my true hero!

I have been struggling with this for nearly 3 months now...

I´ll let you know!

Cheers! 

If you run into any pain let me know.

Just post the infos you need or the error you get.

To test the service you can call the url directly like: domain.com/imageservice.ashx?...

You see the detailed infos there.

Thank you, I just created the generic handler and get this error message:

http://www.ergona.se/modules/products/ImageHandler.ashx

AH okay just delete this line of code.

Ok, I deleted the file, now I seemed to have written something wrong where the url is supposed to be, please have a look at the same link.

GetImageFromURL("http://www.ergona.se" + context.Request["src"]);

The Url has to be like: http://www.ergona.se/modules/products/ImageHandler.ashx?r=1src=images/productimages/test.jpg

Now I get this:

Line 1:  
Line 2:  
Line 3:  using System;

<%@ WebHandler Language="C#" Class="ImageHandler" %>

is missing

Here is my code:  (I want to retrieve images from a folder with path "images/ProductImages"

<%@ WebHandler Language="C#" Class="ImageHandler" %>

using System;

using System.Web;

using System.Collections.Generic;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Net;

using System.IO;

namespace SitesBytes.ImageHandler{

public class ImageHandler : IHttpHandler

double sizeFactor = width / sourceImage.Width;

Bitmap newImage = new Bitmap((int)width, (int)newHeigth);

HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);

Stream stream = httpWebReponse.GetResponseStream();

get

I see.

The code of this service is thought to include in a master or any control which calls an Image. It dynamically renders the Image down to a size.

It doesnt create a batch out of every file in the folder. You just replace the classic <IMG> src with the new adress of the Image service.