தொழில்முறை பனை புகைப்பட தரநிலைகள்

A usable palm photo should show an open palm, fingers up, wrist down, thumb visible, full palm centered, adequate light, and enough resolution to see the major creases. Decorative images, screenshots, documents, or cropped hands should be rejected.

For a palm-facing photo, a right hand usually has the thumb on the viewer's left, while a left hand usually has the thumb on the viewer's right. But camera mirroring and rotation can confuse this, so the interface should let users rotate, center, and confirm.

Retake suggested should always explain why.

If quality is strong, the reading can speak more directly. If quality is usable, the reading should be cautious. If quality is poor, the product should not generate a fake reading; it should ask for a better image.