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2K is the shorthand name for a category of Cinema-specific video modes. While not directly specified by the term, the resolution consists of 1,080 lines of vertical resolution using progressive scan. 2K is considered an High Definition Cinema video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal (display) resolution of 2,048 pixels across and a frame resolution of 2048 × 1080, or exactly 2,211,840 pixels.
2K is referred to in marketing materials as "High Definition".