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  2. Group 4 compression - Wikipedia

    en.wikipedia.org/wiki/Group_4_compression

    Group 4 compression is available in many proprietary image file formats as well as standardized formats such as TIFF, CALS, CIT (Intergraph Raster Type 24) and the PDF document format. G4 offers a small improvement over G3-2D by removing the end-of-line (EOL) codes. G3 and G4 compression both treat an image as a series of horizontal black ...

  3. Book scanning - Wikipedia

    en.wikipedia.org/wiki/Book_scanning

    Common file formats are DjVu, Portable Document Format (PDF), and Tag Image File Format (TIFF). To convert the raw images optical character recognition (OCR) [1] is used to turn book pages into a digital text format like ASCII or other similar format, which reduces the file size and allows the text to be reformatted, searched, or processed by ...

  4. Image scanner - Wikipedia

    en.wikipedia.org/wiki/Image_scanner

    Alexander Murray and Richard Morse invented and patented the first analog color scanner at Eastman Kodak in 1937. Intended for color separation at printing presses, their machine was an analog drum scanner that imaged a color transparency mounted in the drum, with a light source placed underneath the film, and three photocells with red, green, and blue color filters reading each spot on the ...

  5. Non-photo blue - Wikipedia

    en.wikipedia.org/wiki/Non-photo_blue

    The difference between the non-photo blue and black ink is great enough that digital image manipulation can separate the two easily. If a black-and-white bitmap setting is scanned in, the exposure or threshold number can be set high enough to detect the black ink or dark images being scanned, but low enough to leave out the non-photo blue.

  6. Inkjet printing - Wikipedia

    en.wikipedia.org/wiki/Inkjet_printing

    Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper and plastic substrates. [1] Inkjet printers were the most commonly used type of printer in 2008, [2] and range from small inexpensive consumer models to expensive professional machines.

  7. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    Its D format sits between a B format and the next larger A format (just like C sits between A and the next larger B). The remaining formats fit in between all these formats, such that the sequence of formats A4, E4, C4, G4, B4, F4, D4, *H4, A3 is a geometric progression , in which the dimensions grow by a factor 2 16 {\displaystyle {\sqrt[{16 ...

  8. Pan and scan - Wikipedia

    en.wikipedia.org/wiki/Pan_and_scan

    A 2.35:1 film still panned and scanned to smaller sizes. At the smallest, 1.33:1 (4:3), nearly half of the original image has been cropped. Pan and scan is a method of adjusting widescreen film images for fullscreen proportions of a standard-definition, 4:3 aspect ratio television screen.