Faces, presets and settings

Choosing the face

FaceTweak looks for faces on every frame and changes one of them. These controls, in the Face Detection section, decide which one.

Face to Adjust1st Face to 4th Face · default 1st Face

Faces are ranked from largest to smallest; if two are the same size, the one nearer the centre of the frame comes first. 1st Face is therefore usually the main person in the shot. To change two people, use two copies of FaceTweak, one set to 1st Face and the other to 2nd Face.

Detection CropLeft, Right, Top and Bottom · 0 to 1 · default 0

Tells FaceTweak to ignore part of the frame when it looks for faces. Each value is a fraction of the frame, measured in from that edge: Detection Crop Left at 0.5 ignores the left half. The two sides of a pair must add up to less than 1.

Use it to skip a face you don’t want, such as a face on a TV or a poster in the background, or to keep FaceTweak on one person when two people swap sizes. Only the search is affected: the picture isn’t cropped. The values can be keyframed to follow someone who moves across the frame.

Show Face Detectable RegionOn or off · default off

Shades the ignored parts of the frame red, so you can see what Detection Crop is doing. It’s hidden automatically when you render a clip, but not when you export a single still, so turn it off before grabbing stills.

No FaceOutput section · Pass Through · Fail Render · default Pass Through

What happens on a frame where FaceTweak can’t find the face, for example when the actor turns away or walks out of shot. Pass Through leaves those frames exactly as they were. Fail Render stops the render with an error instead, so a missed face can’t slip through unnoticed.

Presets

A preset saves your whole FaceTweak setup: slider values, smoothing, masking, preview and processor settings. Use them to reuse a look across shots, or to keep a starting point you like. Presets are stored on your computer for your user account, so they’re available in every project.

1. To save, type a name into Preset Name and click Save Preset. Saving with a name that already exists replaces that preset.
2. To use one, choose it from Preset and click Recall Preset. The settings are applied at the playhead.

Preset

The list of presets. It includes two built-in ones, Max Quality Preview and Max Responsiveness Preview, which set up previews for the best picture or the fastest response. Built-in presets can’t be changed or deleted.

Preset Name

The name for a preset you’re about to save.

Save Preset

Saves the current setup under that name.

Recall Preset

Applies the preset chosen in the list.

Delete Preset

Deletes the preset chosen in the list.

Refresh Presets

Reloads the list, for example to pick up a preset you just saved from FaceTweak on another clip.

Preview speed and quality

While you drag a slider, FaceTweak can show a lighter preview so the picture keeps up. A moment after you let go, the frame settles to full quality. Renders always use full quality, whatever you choose here.

Preview PolicyAdaptive · Maximum Quality · Maximum Responsiveness · Manual · default Adaptive

• Adaptive learns how quickly your computer works and uses a lighter preview only when it needs to.
• Maximum Quality shows full quality even while you drag. Sliders may feel slower to respond.
• Maximum Responsiveness favours a quick response while you drag.
• Manual uses the quality you pick in Manual Preview Tier.

It sits at the very top of the controls. On some computers the lighter previews aren’t available, and FaceTweak simply shows full quality.

Manual Preview TierPerformance section · Preview · Full · Economy · default Preview

The preview quality used when Preview Policy is Manual. Economy is the lightest and is only available here. Whatever you choose, the frame settles to full quality when you stop.

Decoded Pixel Cache (MB)Performance section · 0 to 2048 · default 128

Memory FaceTweak sets aside to remember recent work, so going back to a frame you’ve already seen is quicker. Lower it on a computer that’s short of memory, or raise it if you often jump back and forth while comparing settings. 0 turns it off.

Reset Performance ProfilePerformance section

Makes Adaptive previews forget what they’ve learned about your computer’s speed, and start learning again carefully. Useful after a hardware change.

Colour

Input EncodingOutput section · Auto · sRGB · Rec709 Gamma 2.4 · DaVinci Intermediate · ACEScct · default sRGB

Tells FaceTweak what kind of colour the picture is in at the point where FaceTweak sits, so its AI sees natural skin tones and hands the picture back in the same colour.

• A standard Rec.709 project, which is most projects: choose Rec709 Gamma 2.4. sRGB, the default, is close.
• DaVinci colour management with a DaVinci Wide Gamut / DaVinci Intermediate timeline: choose DaVinci Intermediate.
• An ACES project using ACEScct: choose ACEScct.
• Auto currently behaves the same as sRGB, so it’s better to choose one of the others yourself.

If the face looks slightly different in colour or contrast from the rest of the picture, check this setting first.

Processor

These are in the Output section. The defaults are right for almost everyone, so change them only if support suggests it, or while troubleshooting.

Inference BackendAuto · CPU · CUDA · Core ML · default Auto

Which part of your computer does FaceTweak’s heavy work. Auto picks the fastest one available: your NVIDIA graphics card on Windows, or Apple silicon on a Mac. CPU uses the main processor only, which is much slower. CUDA forces an NVIDIA card. Core ML is another Mac option, but Auto is the recommended setting on Apple silicon. Leave this on Auto.

GPU Device0 to 31 · default 0

If your computer has more than one graphics card, which one to use. 0 is the first.

CUDA Failure PolicyFail Render · Fall Back to CPU · default Fall Back to CPU

What happens if the NVIDIA card runs into a problem. Fall Back to CPU tries again on the main processor, which is slower but keeps the render going. Fail Render stops with an error so you know something went wrong.

The first time FaceTweak runs in a Resolve session it loads its AI models, which can take several seconds. After that it stays ready.