WinSnap is a complete program which you will be able to capture screens with. I lets you configure the kind of screenshot you want to do (fullscreen, rectangular area, full webpage,...)
But maybe you have seen this before, so the important feature included in this piece of software is that it also includes a built-in editor, so you will be able to edit your screens without having to use a third party program.
Of course, it includes shortcuts which will ease your task and will let you capture screens just pressing one key, and you will be able to configure them.
From now on, once you capture a screen, you'll decide if you are going to modify it or not and it will not be a problem.