[Cropping and Clipart questions]

When changing the color of an object in a photo (e.g. a hat) is there a tool that allows you to re-color it all at once, rather than using a paintbrush? Can it be colored while still seeing the details of the object?

I'm a novice too, and just learned how to change colors from the information in this post. http://paintdotnet.forumer.com/viewtopic.php?f=15&t=5176&start=0

It took me some time to get the hang of it, but I'm doing pretty good with it now.