When Print Screen is not enough …

… then I reccomend you use SangIt. It is especially useful when you need to capture a scrolling window in one image. All major formats are available e.g. jpg, png, gif, bmp, tif and others. It is also possible to record video (for example, when you want to instruct somebody to do something in a certain way). Feel free to explore it and I’m certain you will find many features you will later use.