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  1. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 3840 × 2160 (4K UHD) with a 16:9 aspect ratio is the dominant 4K standard, whereas the movie projection industry uses 4096 × 2160 (DCI 4K).
    en.wikipedia.org/wiki/4K_resolution
    The Digital Cinema Initiatives (DCI), a group of motion picture studios that creates standards for digital cinema, defines 4K resolution as 4096 x 2160, but this resolution is rare in consumer products. You'll usually see PC monitors, laptops and TVs labeled as 4K have a 3840 x 2160 resolution.
    www.tomshardware.com/news/4k-definition,37642.…
    4K resolution, or Ultra HD, refers to a display resolution that boasts approximately 4,000 pixels horizontally. The standard 4K resolution for television and consumer media is 3840 x 2160 pixels, while the resolution used in the film and video production industry is slightly higher at 4096 x 2160 pixels.
    www.geeky-gadgets.com/4k-resolution-demystifie…

    Here's how to compare 1080p, 4K and 8K resolution to the pixel resolution of even modestly priced digital still cameras:

    • 1080p (1920x1080) is 2.1 megapixels.
    • 4K (3840 x 2160 or 4096 x 2160) is about 8.5 megapixels.
    www.lifewire.com/4k-resolution-overview-and-pers…

    Since then, media players like TVs and mobile devices have evolved to support different video resolutions, including:

    • Standard definition (SD): 640x480 pixels or 480p
    • High definition (HD): 1280x720 pixels or 720p
    www.descript.com/blog/article/four-k-resolution
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