The Selfie Distortion Problem
The front-facing camera on most smartphones uses a wide-angle lens, typically equivalent to 23–28mm on a full-frame camera. When held close to the face, as it is during a selfie, a phenomenon called perspective distortion occurs. Features closest to the lens, typically the nose, appear proportionally larger relative to features further away. The nose may look 20–30% wider; the jaw and ears appear narrower; the overall face looks rounder than it actually is.
These are not minor cosmetic changes. They are systematic geometric distortions that shift your facial embedding toward celebrities who naturally have wider noses and narrower jaws, even if your actual bone structure looks nothing like theirs. The network faithfully encodes what is in the image, not what your face actually looks like from a normal distance.
Why Rear Camera Photos Are More Accurate
The rear camera on most smartphones uses a longer focal length lens than the front camera, typically 26–28mm equivalent on older models, and often longer on modern portrait mode configurations. When combined with being held at arm's length or further, this eliminates most of the perspective distortion that degrades selfie-based matching.
A photo taken with the rear camera at 60–90 cm distance produces facial proportions close to what a 85–100mm portrait lens would produce, the standard for professional headshots and the range best represented in celebrity training data. The nose appears its actual width; the jaw and ear spacing are correct; the face proportions are what the network expects from its training distribution.
Practical Photo Tips
For the most accurate celebrity match, use the rear camera and hold the phone at arm's length, or ask someone else to take the photo from about 1–2 metres away. Frame the photo so your face takes up roughly half to two-thirds of the image height. Good lighting should illuminate both sides of your face evenly.
If you only have selfies available, choose one taken at maximum arm extension with the phone held as far from your face as possible. The distortion decreases with distance. Avoid using the extreme wide-angle 'ultrawide' camera mode, these have even shorter focal lengths and produce more pronounced distortion.