The actual resolution of 720p is 1280*720 pixels, that is, 921600 pixels. 720p or 720I is megapixels, and the corresponding camera is megacameras.
The actual resolution of 960p is 1280*960 pixels, that is, 1228800 pixels. Usually, people call 960p or 960i the resolution of 1.3 million pixels, and the corresponding camera is 1.3 million pixels.
The actual resolution of 1080p is 1920*1080 pixels, that is, 2073600 pixels. Generally, people call 1080p or 1080i the resolution of 2million images, and the corresponding camera is a 2million pixel camera.
4K has a resolution of 3840*2160 pixels (UHD) in TV and consumer media, that is, 8294400 pixels, and the corresponding camera is an 8million pixel camera. In the film projection industry, 4K uses a resolution of 4096*2160 pixels (DCI).
