# Face following, chroma key and speed curves

> The frame follows the face, chroma key removes a green screen for free, speed curves and smooth slow motion, rotation and opacity keyframes, an animated mask.

Source: https://docs.slicer.media/en/changelog/editor-frame-motion/

## Frame

-   ****Follow the face**** — a new button on the **Frame** editing layer: the crop window smoothly follows the speaker through the whole clip, with no jerks or jitter. If the AI montage has already found the face, following turns on right away and for free. Otherwise your iPhone, iPad or Mac finds the face itself — for free — or an AI in the cloud does it at cost. You can adjust a following frame by dragging at any moment of the clip.
-   ****Chroma key**** in the **Background** panel: a green or blue screen turns transparent, with a color or a project photo behind. The screen color is picked by itself from the frame edges or with an eyedropper on the preview; **Similarity**, **Smoothness** and **Remove fringe** polish the edge. No AI, and free.
-   **The mask** now moves across the frame, rotates and inverts, and **Animation point** lets it travel along with an object. Drag the shape right on the preview; in the app, twist with two fingers to rotate it.

## Motion

-   **Keyframes** do **Rotation** and **Opacity**, and each point has an easing to the next one: **Smooth**, **Linear**, **Ease in** or **Ease out**.
-   **Volume points**: **Volume point** in the **Volume** panel — a clip's sound rises or fades smoothly between points.

## Speed

-   **Speed curves** — the **Curve** tab in the **Speed** panel: six ready-made curves — **Montage**, **Hero**, **Bullet**, **Flash**, **Ramp up**, **Ramp down** — and your own on a graph with points. For b-roll without speech.
-   ****Smooth slow motion**** creates frames between the real ones: a slowed-down clip of up to 10 seconds moves smoothly, as if shot at a high frame rate. Free, made in the background.

## Public API 1.5.0

New edit operations: `set_framing` (with `track` — face following), `set_keyframe`, `remove_keyframe`, `set_mask`, `set_chromakey`, `set_speed_curve`, `set_smooth`, `set_volume_keys`. They're also in the MCP tool `edit_project`.

[Follow the face](https://docs.slicer.media/en/guide/editor/frame/#follow-face) · [Chroma key](https://docs.slicer.media/en/guide/editor/frame/#chroma-key) · [Keyframes](https://docs.slicer.media/en/guide/editor/keyframes/#rotate-opacity) · [Speed curves](https://docs.slicer.media/en/guide/editor/speed-volume/#speed-curve) · [API operations](https://docs.slicer.media/en/api/editing/#ops-frame)