how come when you take a picture of a screen or monitor, particularly an image with stripes, the still photo appears to “move”?
In: Technology
Just like your TV the monitor is being refreshed by a small increment 60 or more times every second.
When you capture the still image with a camera, those small incremental changes which our brain makes into a continuous smooth image are revealed for not being actually continuous.
Displays on monitors/screens aren’t static images as they appear to be. They have something known as a refresh rate, where the image is constantly being updated. This usually isn’t perceptible to the naked eye, but it can be to a camera lens.
In addition to other commenters, the TV does not updated the whole screen at once but one row at a time. This is why you may see a “wiping” across the screen, the camera is just barely out of sync with the screen refresh.
I would guess that that is why the stripes make a difference, if they are horizontal.
Slo mo guys did a video on TV screens and it’s pretty good.
Latest Answers