You might consider looking at a program named "IrfanView". It is free to download, allows you to drag a box with adjustable sides, then crop. It has a resize/resample function that you pick the size in inches or pixels and it will resize it for you, either bigger or smaller. The program is very simple to operate, will allow you to change brightnes, color, and contrast, and it will read just about any graphic/video type on earth. It has, however, very basic drawing capabilities so is better for viewing and manipulating a graphic file than drawing on it.
Thx
MikeR C