This is an image most other screenshot tools create. Also if you use the PrtScrn key, it looks similar.
This image is created with Shotty, in low quality mode.
Even Aero Glass was enabled, the image is taken with the basic theme.
This image is created with Shotty, in high quality mode.
Note you don't see my desktop wallpaper like in the first screenshot.
Instead you see the background of this webpage through the screenshot's title bar and shadow.
Screenshots taken with Shotty, Background image by www.bittbox.com