When developing for a popular website we implemented a similar feature. One feature that we quickly discovered we needed was the ability to lock down requests to the fancy text generator handler to only calls originating from known sources (referrer) to prevent our bandwidth being used by all and sundry. This is fine if the images are only intended to be used as page content, but if the handler is to be browsed to directly then this simple approach is probably not sufficient. I'm not sure if this fits in to this project directly or not but is something to bear in mind if you are going to implement any kind of image handling that is fancy enough for other people to want to steal.

We can add the handler extension to IIS dynamic cache when using this handler but it could be useful to add an option to automatically store the generated images into a temporary folder.
I think the rendering time is quite CPU expensive so it would be useful to be able to pregenerate images in staging environment and push the images to the live server when pushing new versions of the site.

For the sake of open source competition, SharpPieces proposes a control with similar functionality, maybe a little bit easier to use, http://www.sharppieces.com/demo/dynamicimgeffects.aspx . Check out the rest of examples; the control is free and open source here on codeplex.

For some reason when I use this control the following method is NEVER called

public override ImageInfo GenerateImage(NameValueCollection parameters) {
// Add image generation logic here and return an instance of ImageInfo
Bitmap bit = new Bitmap(300, 60);
Graphics gra = Graphics.FromImage(bit);
gra.Clear(Color.AliceBlue);
gra.DrawString(parameters["Hello"], new Font(FontFamily.GenericSansSerif, 16), Brushes.Black, 0, 0);

return new ImageInfo(bit);
}

I thought this thing was just supposed to work out of the box - I ran this directly from the example posted with the control and the results were less than spectacular. What do I need to do or what did I mess up on this that the overload is never getting called?

Thanks!