Onionskin - Dragonframe
From Help Wiki
Intro
Onion skinning is a technique used in animation that allows an animator to see several frames at once. Dragonframe's main animation window has an onionskin setting, as does the Dragonframe keypad.
Using Onionskin
The onionskin setting in Dragonframe is controlled by keypad or the slider in the animation window. The Onionskin Opacity Slider adds an onionskin layer of a previous frame over the Live View. You can adjust how translucent that layer appears, or select which frame you choose to layer.