01
What stays stable
Facial geometry, expression, skin tone, pose, clothing and background belong to B. Hair shape and optionally color are the intended change.
IDENTITY IS A HARD GATE
The identity boundary a future result must pass.
The target photo supplies identity and scene, while changes must stay limited to hair. A checked result is still a preview, not a salon guarantee.
The identity and locality contract a HairWhatIf result must satisfy.
02
What the checker measures
The release contract requires signals for identity similarity, edit locality, hairstyle structure and artifacts. Hard failures cannot be averaged away by a pretty image.
03
What happens on failure
A compliant quality miss may receive one directed repair. Serious drift after the final check must not be delivered; billing settlement remains tied to delivery.
04
What we do not claim
A passed run is not a guarantee that every facial pixel is unchanged, nor that a salon will reproduce the preview exactly.