How do I enable logging or debug output for ImageResizer in C#?

I'm using ImageResizer in C# app. Some of the functionality I want to use does not have an associated property in the Instructions object. The docs say, "Just because a key doesn't have a property wrapper doesn't mean you can't use it. i["key"] = value; isnt' that scary."

However, you can put any nonsense in the Instructions Dictionary and nothing will be reported. This means that if I've done something wrong I'm unlikely to notice my mistake.

How can I view log output that will tell me what ImageResizer is doing so I can catch my mistakes?

Roughly what I'm doing:

var instructions = new Instructions
    Mode = FitMode.Max,
instructions["fastscale"] = "true";
instructions["down.filter"] = "RobidouxSharp";

var bitmapImage = new BitmapImage();
using (var stream = new MemoryStream())
    var job = ImageBuilder.Current.Build(path, stream, instructions);
    stream.Position = 0;

    bitmapImage.StreamSource = stream;