Choosing a webcam background for a job interview

1. A tidy real room, lit from the front. This wins, and it is not close. Real light and real depth are what make you look like a person on a camera rather than a cut-out, and there is no edge to go wrong. Clear the frame, face a window, and you are done — no software involved.

2. A plain wall. Boring in the best sense. A mid-toned, unpatterned wall gives the interviewer nothing to look at and your camera an easy exposure. Sit two or three feet away from it rather than against it, so you are not casting a hard shadow onto your own backdrop.

3. A blur. The right answer when the room cannot be fixed in the fifteen minutes you have. It keeps the light and depth of a real space while making its contents unreadable, and when the mask slips for a frame the mistake is blur against blur — invisible. This is the option to default to if you are unsure.

4. A discreet replacement backdrop. A neutral studio or a plain office. Workable, and worth testing before you rely on it: a clean image behind you makes every wobble in the boundary around your hair visible, and it looks worst exactly when you gesture or lean.

Not on the list: anything scenic, anything with text, anything animated, and anything that implies you are somewhere you are not. They all cost attention and buy nothing.

An interviewer is not evaluating your backdrop. They are, involuntarily, noticing motion — and the mask around a person is the one thing in the frame that moves in a way nothing in the real world does. A shoulder that briefly disappears, a halo that flickers when you turn your head: these register as something being wrong even when the viewer could not say what.

That is the argument for the boring options. A plain wall has no boundary to get wrong. A blur makes the boundary's errors indistinguishable from its successes. A crisp photographic backdrop is the only choice that puts the mask on trial for the whole interview.

If you do want a backdrop, buy yourself a better edge first: light your face from roughly where the camera is, and get some distance from the wall behind you. Why that works, and what to change.

• Sit where you will actually sit, and look at your own camera preview.
• Remove anything in frame you would not want asked about.
• Turn on a light in front of you and turn off the one directly behind you. Check that your face is the brightest thing in the picture.
• Raise the camera to eye level. Books under a laptop are the standard fix and they work.
• If you are using a blur or a backdrop, turn your head slowly once and watch the edge. If it crawls, add light before you change background.
• Close everything else on the machine. Effects are the first thing to stutter.