The specification of a Sony mobile phone is as follows: Screen: 5.2 inch, 1080 x 1920 pixels Camera: 19 MP, 2160p
first, what does the value 2160p represent?
Second: multiplying 1080 x 1920 pixels will give 2,073,600 pixels which is much less than the 19 megapixels of the camera. How the 19 megapixels image be displayed on the 2,073,600 pixels screen? Will the image be downsampled such that the number of its pixels matches the number of pixels on the screen? If so, then what is the benefit of capturing an image with high megapixel value?