Preferences

Data Marker Tab

Here you can choose the color of the markers of all digitized data points. The line marker size determines the dot size that is painted for markers that are automatically digitized on lines. Defaults are green and 2 x 2 pixels.

Screenshot Tab

DigitizeIt waits a specified amount of time after it hides its own window before it takes the screenshot. This is necessary to give the other applications time to repaint themselves. If you see the DigitizeIt main window on top of your screenshots or just a white rectangle where the DigitizeIt window previously was, then increase this time.