Sony DSC-RX100M3 - Manual (Page 114)

that face turns white. The face detection frames of other registered faces turn reddish-
purple.
Tips for capturing smiles more effectively
Do not cover the eyes with front hair and keep the eyes narrowed.
Do not obscure the face by a hat, masks, sunglasses, etc.
Try to orient the face in front of the product and be as level as possible.
Give a clear smile with an open mouth. The smile is easier to be detected when the teeth
are shown.
If you press the shutter button during Smile Shutter, the product shoots the image. After
shooting, the product returns to Smile Shutter mode.
Hint
When the [Smile/Face Detect.] is set to [Smile Shutter], you can select the Smile
Detection Sensitivity from [On: Slight Smile], [On: Normal Smile] and [On: Big Smile].
Note
You cannot use the Face Detection function with the following functions:
When using zoom functions other than the optical zoom
[Sweep Panorama]
[Picture Effect] is set to [Posterization].
When using the [Focus Magnifier] function.
Up to eight faces of your subjects can be detected.
The product may not detect faces at all or may accidentally detect other objects as faces
in some conditions.
If the product cannot detect a face, set the Smile Detection Sensitivity.
If you track a face using [Lock-on AF] while executing [Smile Shutter], Smile Detection is
performed only for that face.
[115] How to Use Using shooting functions Setting the other functions of this product
Soft Skin Effect (still image)