This is a very powerful and feature-rich tool for taking screenshots. Written in GTK and blending well in GNOME, Shutter offers just about anything you would ask from such an application: timer, screenshots of whole screen, windows, widgets, a quick and easy-to-use editor for fast retouching or pointing out certain aspects of the image, support for plugins, exporting/importing and saving to PNG, JPG or BMP. Definitely a winner in my opinion.
This is the default screenshot application that comes with the GNOME desktop environment, offering a very basic graphical interface. It’s triggered by pressing Print Screen, and by default it will take the screenshot of the whole screen. Here’s how it looks:
Although it allows to take screenshots of only windows or section of the screen, unfortunately these are not available in the graphical interface, but can be triggered by running gnome-screenshot in a terminal with certain parameters. For example, gnome-screenshot -w will take the screenshot of a window, gnome-screenshot -a will take the screenshot of a screen area, while gnome-screenshot -B will take the screenshot of a window, excluding window borders. Why these don’t have a corresponding tick box in the graphical window is still a mystery to me. That being said, GNOME Screenshot is a very fast choice if you quickly want to grab the whole screen and dump it to a file.
This is the screenshot application used by KDE and provides a timer as well as possibility to take the screenshot of a particular area of the screen or only a window, include or exclude window decorations. Pretty fast and easy to use.
Actually the tool is called import and it’s included in the imagemagick package. It can be used in the command-line mode and comes with various options. It can be a little hard to manipulate it and maybe not the best recommendation for a person who uses only GUI, but otherwise it’s very powerful. The easiest way to take a screenshot using it would probably be something like import image.png, and then select the region of the screen you want to capture.
Or SCReen SHot, scrot is yet another powerful tool for taking screenshots in command-line mode. The simplest way to use it would be scrot image.png, which will take a screenshot of the whole screen and save it in the current directory as image.png. To set a delay time in seconds, use the -d switch, e.g. scrot -d 3 image.png.
…And one more
Probably well-known by most users who use to edit images on a daily basis or even occasionally, GIMP is a very powerful and feature-rich image manipulation application. One of the features it also has is the ability to take screenshots. To use it, go to File->Create->Screenshot… and select the desired options in the window that appears.