Prerequisites

A working Flutter quickstart
One initialized NosmaiCameraPreview

Apply a subtle preset

Call the beauty methods after onInitialized:

final nosmai = NosmaiFlutter.instance;

await nosmai.applySkinSmoothing(0.35);
await nosmai.applySkinWhitening(0.10);
await nosmai.applySharpening(0.15);
await nosmai.applyTeethWhitening(0.20);

Parameter ranges

Method	Range	Off value	Visible result
`applySkinSmoothing`	`0.0` to `1.0`	`0.0`	Softens skin detail
`applySkinWhitening`	`0.0` to `1.0`	`0.0`	Brightens skin tone
`applySharpening`	`0.0` to `1.0`	`0.0`	Restores edge detail
`applyTeethWhitening`	`0.0` to `1.0`	`0.0`	Brightens detected teeth

For a slider, clamp the value and avoid awaiting stale updates after the widget has been disposed.

Reset beauty

await NosmaiFlutter.instance.removeBuiltInFilters();

Verify it worked

Set smoothing to 0.0, then 0.35, while a face is visible. The preview should change without rebuilding NosmaiCameraPreview.

Common errors

Symptom	Cause	Fix
`SDK not initialized. Please initialize the SDK first.`	The method ran before initialization	Await `NosmaiFlutter.initialize` before mounting the camera screen
No visible change	The callback ran before the native preview was ready	Apply from `onInitialized`
Preview restarts while dragging	The camera widget is rebuilt with a changing key	Keep one stable preview and update only the effect value

Apply a beauty filter in Flutter with Nosmai Effects