Estás en lo cierto, Davimo.
1440x1080 son 1,4K (HDCAM)
1920x1080 son 1,9K (HDCAM-SR)
2048x1556 son 2K
Támbién tendrían equivalente en MegaPixels (producto de multiplicar la resolución horizontal por resolución vertical), pero no se utiliza en términos cinematográficos.
There are three ways to do any shot. There's fast, there's good and there's cheap. But you can only work in combinations of two. You can have it cheap and you can have it fast, but can't have it good; you can have it fast and you can have it good, but you can't have it cheap; you can have it good and you can have it cheap, but you can't have it fast. John Dykstra, ASC.