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  2. Photo print sizes - Wikipedia

    en.wikipedia.org/wiki/Photo_print_sizes

    The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

  3. Image resolution - Wikipedia

    en.wikipedia.org/wiki/Image_resolution

    An image of N pixels height by M pixels wide can have any resolution less than N lines per picture height, or N TV lines. But when the pixel counts are referred to as "resolution", the convention is to describe the pixel resolution with the set of two positive integer numbers, where the first number is the number of pixel columns (width) and ...

  4. List of photographic film formats - Wikipedia

    en.wikipedia.org/wiki/List_of_photographic_film...

    120 × 90 mm Possibly discontinued 1924 or 1929 115 roll film 1898 1949 6 + 3 ⁄ 4 × 4 + 3 ⁄ 4 in 171.45 × 120.65 mm 116 roll film 1899 1984 2 + 1 ⁄ 2 × 4 + 1 ⁄ 4 in 63.5 × 107.95 mm Like 616 film with wider flanges 117: roll film 1900 1949 2 + 1 ⁄ 4 × 2 + 1 ⁄ 4 in 57.15 × 57.15 mm 6 Like 620 spool with 120 keyslot 118 roll ...

  5. Dots per inch - Wikipedia

    en.wikipedia.org/wiki/Dots_per_inch

    Actual size is approximately 1 ⁄ 4 by 1 ⁄ 4 inch (6 by 6 mm). Individual coloured droplets of ink are visible; this sample is about 150 DPI. Dots per inch (DPI, or dpi [1]) is a measure of spatial printing, video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch ...

  6. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    In motion picture formats, the physical size of the film area between the sprocket perforations determines the image's size. The universal standard (established by William Dickson and Thomas Edison in 1892) is a frame that is four perforations high. The film itself is 35 mm wide (1.38 in), but the area between the perforations is 24.89 mm × 18 ...

  7. Pixel binning - Wikipedia

    en.wikipedia.org/wiki/Pixel_binning

    For example, in 2x2 binning, an array of 4 pixels becomes a single larger pixel, [3] reducing the number of pixels to 1/4 and halving the image resolution in each dimension. The result can be the sum, average, median, minimum, or maximum value of the cluster. [ 4 ]