ScreenShot Lightscreen is a s a simple tool to automate the tedious process of saving and cataloging screenshots
It operates as a hidden background process that is invoked with one (or multiple) hotkeys and then saves a screenshot file to disk according to the user’s preferences.
It has no built-in editing or annotation tools,Lightscreen has features to set a delay time and save screenshots in multiple image formats.

Extremely configurable
Choose! Use only the hotkeys, get previews of your screenshots, upload all of them automatically and more.

Snap what you need
You can resize and readjust the area of the screen you wish to capture for maximum flexibility.

Upload support
Quickly share what’s on your screen by uploading imgur.com and a variety of other image hosts!

Organized
Using an automatic naming system, number your screenshots sequentially or use the date and time.

ScreenShot Lightscreen is open source and its code can be found at:
https://github.com/ckaiser/Lightscreen