What Is Video Compositing?
Video compositing is the process of combining multiple visual elements — footage, graphics, charts, titles — into a single video frame. In the context of animated data charts, compositing means placing an animated chart with a transparent background (alpha channel) over footage or a branded background in a video editor. The result: the chart animates cleanly over the background without a white box or masking work.
Alpha Channel Compositing
Alpha channel compositing works by reading the transparency information stored in each pixel of a graphic element. Pixels with alpha=0 are fully transparent — the layer below shows through. Pixels with alpha=255 are fully opaque — the graphic appears. Semi-transparent pixels blend the two layers proportionally.
When you place a framechart generator on a track above footage in DaVinci Resolve, the chart renders with its alpha channel directly in the timeline — and a ProRes 4444 export composites the same way in Premiere Pro. No additional keying, masking, or rotoscoping.
Compositing in DaVinci Resolve
- 1. Import PNG sequence via Media Pool → right-click → Add Folder and Group By
- 2. Drag the sequence clip to your timeline on a track above your footage
- 3. DaVinci Resolve reads the RGBA alpha channel automatically — no blend mode changes needed
- 4. The chart animates over your footage with full transparency
Compositing in Premiere Pro
- 1. File → Import → select first frame of PNG sequence → check "Image Sequence"
- 2. Drag the sequence clip to a track above your footage in the timeline
- 3. Premiere reads the alpha channel — blend mode stays Normal
- 4. If edges look fringe-y: right-click clip → Modify → Interpret Footage → adjust alpha type
Clean Template for Compositing
Framechart's Clean template is designed for compositing — it uses minimal bloom effects and renders chart elements with clean, sharp edges. The Cinematic Dark template has heavy glow effects that look great as a standalone video but may not composite as cleanly over some backgrounds. For professional compositing work, use the Clean template.
Common Compositing Terms
| Term | Definition |
|---|---|
| Alpha channel | Per-pixel transparency data stored alongside RGB |
| PNG sequence | Lossless RGBA frames imported as a single video clip |
| Track layering | Higher timeline tracks appear in front of lower tracks |
| Blend mode | How pixels from different tracks combine mathematically |
| Keying | Removing a color (e.g., green screen) to create transparency — not needed with alpha channel |
Frequently Asked Questions
What does compositing mean in video editing?
Compositing is layering multiple video elements together: footage, graphics, text, and animated charts. In DaVinci Resolve and Premiere Pro, you layer clips on timeline tracks — higher tracks appear on top, and transparent regions (alpha channel) let lower tracks show through.
How do I composite an animated chart over footage?
In DaVinci Resolve, the framechart plugin composites the chart with transparency directly in your timeline. For Premiere Pro or After Effects, render the chart in Resolve as ProRes 4444 with Export Alpha enabled, then import that file into your NLE and place it on a track above your footage — the alpha channel handles transparency automatically.
Do I need After Effects for video compositing?
No. DaVinci Resolve and Premiere Pro both handle alpha channel compositing natively. For animated data charts specifically, the framechart plugin renders with a transparent background directly in the Resolve timeline — no After Effects Dynamic Link, no file round-trip.
What blend mode should I use for compositing a chart in Premiere?
For PNG sequences with alpha channel, use the "Normal" blend mode — the alpha channel handles transparency. You only need other blend modes (Screen, Lighten) for clips without an alpha channel that have a black or white background.