I was after a smart way to process my images inside Statiq so they are a uniform size, without having to use a 3rd party image manipulation program. This allows me to keep the process in one place and I won't forget about it!
After some digging around, I found this way on Github which solves my problem.
What the following does is add a new pipeline called "ResizeTitleImages", search for images file types inside the blog folder, and resize them twice with the two different output sizes.
public class Program
{
private static async Task<int> Main(string[] args) =>
await Bootstrapper
.Factory
.CreateWeb(args)
.BuildPipeline("ResizeTitleImages", builder =>
{
builder.WithInputReadFiles("assets/images/blog/*.{jpg,png,gif}");
builder.WithInputModules(new MutateImage()
.Resize(960, 720).OutputAsJpeg()
.And()
.Resize(1920, 1440).OutputAsJpeg()
);
builder.WithOutputWriteFiles();
})
.RunAsync();
}