Friday, July 30, 2021

    2k Vs 4k

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    Hey…Do you want to purchase a new TV, monitor or projector? There is a number of resolutions are available in the market. What is the difference between various resolution? Let’s see in brief. As we move beyond 1080p, consumers and the online video world are being enticed by 2K, 4K, and 4K Ultra HD (UHD) and 8K. Here’s a look at what those all mean, as well as what the future might hold.

    Different Resolution

    Resolution Name Other Name Devices Pixels
    720p HD TV 1280 × 720
    1080 p Full HD Monitors and TV 1920 ×1080
    WUXGA Widescreen Ultra Extended Graphics Array Projectors and Monitors 1920 × 1200
    2K None Projectors 2048 × unspecified
    UHD 4K, Ultra HD TVs 3840 × 2160
    4K 4K Projectors 4096 × unspecified
    8K 8K UHD Concepts TVs 7680 × 4320

    8K Video

    In today’s world 8K UHD is the current highest ultra high definition television resolution in digital television and digital cinematography. 8K in 8K UHD refers to the horizontal resolution of 7,680 pixels, forming the total image dimensions of (7680×4320), also known as 4320p, which refers to the vertical resolution.

    2K Video

    We’ll start with the simplest format, as a way to describe how the consumer electronics (CE) companies are shifting the definition away from vertical lines of resolution to something more nebulous.

    If 1080p has 1080 lines of vertical resolution, one would think that the 2K displays have 2,000 lines of vertical resolution, right? Not so fast: 2K is an incremental bump above 1080p. In fact, 2K doesn’t even change the vertical resolution, leaving it at 1080 lines, and only increases the horizontal resolution to a 2048 pixel width. 2K has four times the definition of standard HD and its resolution measurements are 2560X1440 pixels.

    Run the math and you’ll find that the increase from 1920 horizontal pixels to 2048 horizontal pixels is a whopping 3.43 percent increase. Hardly worth chucking the 1080p “True HD” monitor for a 2K one.

    The reason for this confusion lies mainly in the primary purpose of 2K resolutions. To date, 2K has primarily been used for projection within movie theaters, which require a slightly different aspect ratio from consumer HDTVs and computer monitors.

    While consumer displays use a 16:9 aspect ratio (or 1.777:1 is converted to the lowest common denominator), the Digital Cinema Initiative (DCI) backed by the major Hollywood studios uses a 17:9 aspect ratio (approximately 1.85:1) that better aligns with several of 35mm and 70mm films formats used to shoot and project movies.

    As such, the DCI termed the 2048 x 1080 resolution as 2K, and the name stuck even when it came to consumer applications. It’s no wonder that most consumers with decent home theater systems feel like they’re getting an equal or better experience to the movie theater: with the exception of a few more horizontal pixels, the image is exactly the same resolution in 1080p and 2K, and the pixel density (measured in PPI or pixels per inch) is quite a bit denser on a consumer 1080p display.

    Another way to look at it is overall pixels: 1920 x 1080 equals 2,073,600 pixels, while 2K at 2048 x 1080 equals 2,211,840. The difference is 138,240 pixels, and if the pixels were represented as megapixels (Mpx, the typical way we gauge still camera resolutions) the change between 1080p and 2K would be approximately 0.13 Mpx (2.1 versus 2.2 Mpx).

    4K Video

    Now that we’ve looked at 2K, what about 4K? Does it offer resolution benefits beyond 2K and 1080p?

    There are three 4K resolutions to consider, each with a different aspect ratio.

    Let’s consider, first, the DCI version of 4K. The film industry likes to shoot at resolutions at least 3-4 times greater than what it will project, so the DCI came out with a 4K specification at the same time it came out with the 2K display specification. 4K UHD does double the vertical resolution, from 1080 to 2160 vertical lines of resolution.

    DCI 4K has 2160 vertical lines of resolution, which is double that of 1080p. So far so good, but what about the horizontal resolution? It clocks in at 4096 pixels. All told, that’s 8,847,360 pixels or 8.84 Mpx.

    Running the numbers, that means DCI 4K is 4.26 times the resolution of 1080p and exactly 4 times the resolution of 2K. The difference, as we mentioned above, is the aspect ratios of 1080p (16:9) and DCI 2K / 4K (17:9).

    4K Ultra HD (UHD) Video

    Ok, so now that we’ve seen how DCI 4K is four times the pixel count of 1080p, what about the 4K Ultra HD monitors that you’ll be able to buy this month from Samsung, Sony, and others for a cool $25,000 at sizes ranging from 55 to 84 inches?

    4K UHD does double the vertical resolution, from 1080 to 2160 vertical lines of resolution, but it falls short of the 4,000-pixel horizontal resolution, clocking in at 3840 horizontal pixels. If you’ve noticed the pattern of doubling the horizontal resolution, you’ve caught on to the reason that 4K UHD isn’t really 4K: 1920 times two is 3840, meaning that consumer displays will still hold the 16:9 aspect ratio.

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