2K resolution
2K resolution is a picture about 2,000 pixels wide. In cinema it means 2048 x 1080 pixels. For monitors, phones and game streams, 2K is often used for 2560 x 1440, also called 1440p or QHD. Both sit between Full HD (1080p) and 4K, giving a sharper picture than 1080p with far less data than 4K.
Why it matters
2K, in its 1440p form, gives gamers and high-end phone users a noticeably sharper picture than 1080p without the heavy cost of 4K. For a platform, adding a 1440p rung can please demanding viewers while keeping delivery costs well below 4K levels. 1440p streaming on FastPix costs $0.001086 per minute watched, which lets you price a premium tier for gamers and high-end phones from expected viewing.
How it works
- Content is captured or rendered at 2048 x 1080 for cinema, or 2560 x 1440 for screens.
- The encoder adds a 1440p version between 1080p and 4K in the bitrate ladder.
- Viewers with 1440p screens and enough bandwidth receive that version automatically.
Is 1440p 2K or 2.5K?
Both names are used. Strictly, 2K means about 2,000 pixels wide, like the 2048 x 1080 cinema standard, so 2560 x 1440 is closer to 2.5K. In consumer marketing, though, monitors and phones at 1440p are often sold as 2K. When buying or encoding, check the pixel numbers rather than the label.
Is 2K better than 1080p?
Yes, 1440p (often called 2K) has about 78 percent more pixels than 1080p, so it looks sharper, especially on monitors of 27 inches or larger. Cinema 2K at 2048 x 1080 is only slightly wider than 1080p, so the difference there is small. The extra sharpness also needs more bitrate.
Where it's used
Game streaming platforms support 1440p because many PC gamers play and record at that resolution. Video platforms such as YouTube offer 1440p playback for viewers on gaming monitors and high-end phones.
By the numbers
- Digital Cinema Initiatives defined 2048 x 1080 as the full-frame 2K container in its 2005 Digital Cinema System Specification. (2K resolution (Wikipedia))
- YouTube recommends 16 Mbps for 1440p SDR uploads at 24 to 30 fps. (YouTube recommended upload encoding settings)
