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    Image resolution describes the detail an image holds. The term applies to raster digital images, film images, and other types of images. Higher resolution means more image detail.

    Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes (e.g. lines per mm, lines per inch), to the overall size of a picture (lines per picture height, also known simply as lines, or TV lines), or to angular subtenant. Line pairs are often used instead of lines; a line pair comprises a dark line and an adjacent light line. A Line (or TV line, TVL) is either a dark line or a light line. A resolution of 10 lines per millimeter means 5 dark lines alternating with 5 light lines, or 5 line pairs per millimeter (5 LP/mm). Photographic lens and film resolution are most often quoted in line pairs per millimeter.

    An image that is 2048 pixels in width and 1536 pixels in height has a total of 2048×1536 = 3,145,728 pixels or 3.1 megapixels. One could refer to it as 2048 by 1536 or a 3.1-megapixel image.

    Unfortunately, the count of pixels isn't a real measure of the resolution of digital camera images, because color image sensors are typically set up to alternate color filter types over the light sensitive individual pixel sensors. Digital images ultimately require a red, green, and blue value for each pixel to be displayed or printed, but one individual pixel in the image sensor will only supply one of those three pieces of information. The image has to be interpolated or demosaiced to produce all three colors for each output pixel.

    This is a list of traditional, analog horizontal resolutions for various media. The list only includes popular formats, not rare formats, and all values are approximate (rounded to the nearest 10), since the actual quality can vary machine-to-machine or tape-to-tape. For ease-of-comparison, all values are for the NTSC system. (For PAL systems, replace 480 with 576.)

    * Analog and early digital
    o 350×240 : Video CD
    o 300×480 : Umatic, Betamax, VHS, Video8
    o 350×480 : Super Betamax, Betacam (pro)
    o 420×480 : LaserDisc, Super VHS, Hi8
    o 500×480 : Analog broadcast
    o 670×480 : Enhanced Definition Betamax

    * Digital
    o 720×480 : D-VHS, DVD, miniDV, Digital8, Digital Betacam (pro)
    o 720×480 : Widescreen DVD (anamorphic)
    o 1280×720 : D-VHS, HD DVD, Blu-ray, HDV (miniDV)
    o 1440×1080 : HDV (miniDV)
    o 1920×1080 : HDV (miniDV), AVCHD, HD DVD, Blu-ray, HDCAM SR (pro)
    o 2048×1080 : 2K Digital Cinema
    o 4096×2160 : 4K Digital Cinema
    o 7680×4320 : UHDTV
    o Sequences from newer films are scanned at 2,000, 4,000, or even 8,000 columns, called 2K, 4K, and 8K, for quality visual-effects editing on computers.

    * Film
    o 35 mm film is scanned for release on DVD at 1080 or 2000 lines as of 2005.
    o 35 mm original camera negative motion picture film can resolve up to 6,000 lines.
    o 35 mm projection positive motion picture film has about 2,000 lines that results from the analog printing from the camera negative of an interpositive, and possibly an internegative, then a projection positive.
    o IMAX, including IMAX HD and OMNIMAX: approximately 10,000×7000 (7000 lines) resolution.

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