When I take a window screenshot, it looks like this:
How can I make it look like this:
And it's pretty versatile, too. Its features include:
Answering your specific question, it can also either include or exclude the window borders. On elementary, the shadows will always be taken in the screenshot (see below). However, with and without borders will control where the border is - so it will either just be the window you want, then a white background added and then a shadow, or it will be the thing that is actually behind the window, including shadows. Bit complex, look at these pictures, with and without borders:
.deb at their homepage - click Download at the top menu.
You can make beautiful screenshots of windows with shadow using screenshot-tool.
Add this PPA and install package:
sudo apt-add-repository ppa:elementary-os/daily sudo apt-get update sudo apt-get install screenshot-tool sudo apt-add-repository -r ppa:elementary-os/daily
Supported only GTK3+ apps.
Maybe what you want is to able make screenshot of selected area?
If you do, then you can use the keyboard shortcut Ctrl+Shift+PrntScrn, and your cursor will change to make selection, select your desired area, and release your click/mouse, then your image will be saved to your clipboard!
Or, Use Shift+PrntScrn to save your selection.
This is the full list of keyboard shortcuts for screenshot.