camera
Guide layers: onion skin and reference footage in Dragonframe
Dragonframe
Definition
Dragonframe's Guide Layers panel blends the live camera feed against an already-captured frame (onion skin) or an external reference still or video, so an animator can judge a pose change or match an outside source before pressing the capture key -- distinct from traditional hand-drawn onion skinning, which stacks multiple already-drawn frames rather than comparing a live feed to a capture.
Overview
Onion skinning in traditional 2D animation stacks several already-drawn frames so the animator sees the arc of a motion at once. Dragonframe's version solves a different problem: there is no next frame yet to stack, only the puppet sitting in front of the camera right now. The software instead blends the live camera feed over a frame already captured, letting the animator see exactly how far the puppet has moved -- or needs to move -- before triggering the shutter. Live View then offers several ways to check that comparison: stepping directly from a captured frame to the live feed, an auto-toggle that switches between the two at an adjustable speed, a manual toggle key, and a punch-in magnification of the video assist image (supported on Canon, Nikon, Olympus, Fujifilm and select Sony cameras) for judging a small movement -- a finger, a mouth shape -- at native lens resolution rather than guessing from a small preview.
The same Guide Layers panel handles reference material that has nothing to do with the previous frame: an animator can load a still image or a video clip alongside the live feed, blend it in with adjustable opacity, pull a chromakey with a garbage matte to isolate just the part that matters, and pop the reference out into its own synchronized player window if it is easier to work with off to the side. That covers three different jobs with one feature -- matching a puppet's pose to an animatic or previs frame, lining a shot up against a practical plate it has to match, or working rotoscope-style over reference footage for an effects pass -- inside the same application used to shoot the animation, rather than a separate tool.
Both halves of the panel exist to replace judgment calls that used to rely on a paper exposure sheet or a director's eye on set (see exposure-sheet, on-twos): whether a move reads as smooth motion or a jump, and whether a shot lines up with what precedes and follows it, become things the software shows directly rather than things the animator has to hold in memory or check against printed notes.
Workflow
- Capture a frame, then switch Live View into onion-skin mode to blend the current camera feed against that frame.
- Judge the difference -- pose, spacing, silhouette -- before moving the puppet further.
- For an external reference instead, load a still or video into the Guide Layers panel and set its opacity, or pull a chromakey and garbage matte if only part of the frame is needed.
- Pop the reference out to a separate synchronized window if it is easier to keep visible off to the side of the main capture view.
- Capture the next frame once the live feed matches the intended pose or reference position.