Question: how big is a 4k image?
Answer: What is the size of a 4K image (pixel x pixel)? - Quora. Cinema 4K is 4096 x 2160 pixels which equal 8,847,360 total pixels - about 8.8 megapixels displayed on the screen. 4K (Ultra HD) used in TVs is 3840 x 2160 pixels which equal 8,294,400 pixels - about 8.3 megapixels displayed on the screen.