As far as digital cinematography is concerned, video resolution standards depend first on the frames aspect ratio in the film stock and then on the actual points count. Although there is not a single set of standardized sizes, it is common place within motion picture industry to refer to „nk“ image „quality“ where „n“ is a integer number which translates into a set of actual resolutions, depending on the film format. As a reference consider that, for a 4:3 aspect ratio which a film frame is expected to horizontally fit in, „n“ is the multiplier of 1024 such that the horizontal resolution is exactly „1024n“ points.
For example, 2 K reference resolution is 2048 x 1536 pixels, whereas 4K reference resolution is 4096 x 3072 pixels for 4:3 aspect ratio. Nevertheless, 2K may also refer to resolutions like 2048 x 1556, 2048 x 1080 or 2048 x 858 pixels, whereas 4K may also refer to 4096 x 2048 and 2K with 2048 x 1024.
Commercial cameras marketed as digital cinematography cameras typically shoot in progressive HDTV formats such as 1080p, 2K and 4K.
To date, 1080p has been the most common format for digitally acquired major motion pictures, however since 2008, 2K and 4K are gaining market shares.
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