# Why there is difference between image size and video resolution of a specific camera? [closed]

I was searching to buy a camera, but I saw in specs they wrote:

2MP(full hd) video recording
5MP image size


Why the vido size is 2MP but image size is 5MP? How they calculate these numbers?

If I had a camera that could shooting in 4K, how can I find it's photo's size in MegaPixel?

• What does this have to do with electrical engineering? – pipe Jan 6 '18 at 6:54
• @pipe: Where should I ask this? May you transport it to right place? – user8663682 Jan 6 '18 at 7:00

• Thank you, nice answer! I have other question: If a camera has 5MP cmos sensor, but it records 2MP videos, is that mean, it doesn't use all of it's CMOS sensor's area(border pixels) while recording videos? – user8663682 Jan 6 '18 at 8:02
• Also, shouldn't you multiply the 1920*1080*60 by 3 or 4 respect to the image type(I think RGB colored images have 3 or 4 channels per pixel) – user8663682 Jan 6 '18 at 8:14