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Encyclopedia > Posterization
An example of a photo in JPEG format (24bit colour or 16.7 million colours) before posterization, constrasting the result of saving to GIF format (256 colours). Posterization occurs across the image, particularly obviously in areas of subtle variation in tone.
An example of a photo in JPEG format (24bit colour or 16.7 million colours) before posterization, constrasting the result of saving to GIF format (256 colours). Posterization occurs across the image, particularly obviously in areas of subtle variation in tone.

Posterization occurs when a region of an image with a continuous gradation of tone is replaced with several regions of fewer tones, resulting in an abrupt change from one tone to another. This creates an effect somewhat similar to that of a simple graphic poster. Image File history File linksMetadata Download high resolution version (658x894, 241 KB) Summary The following is an example of a scenario where posterization may occur, and relates to the image above. ... Image File history File linksMetadata Download high resolution version (658x894, 241 KB) Summary The following is an example of a scenario where posterization may occur, and relates to the image above. ... A photo of a flower compressed with successively lossier compression ratios from left to right. ... GIF (Graphics Interchange Format) is a bitmap image format for pictures that use 256 (or fewer) distinct colors (though there is a workaround for this limitation) and animations that use 256 (or fewer) distinct colors per frame. ... 1942 US government war poster. ...


Posterization can also be achieved digitally in most photo-editing programs


Definition: a process in photograph developing which converts normal photographs into an image consisting of distinct but flat areas of different tones or colors. A posterized image often has the same general appearance, but replaced by abrupt changes in shading and gradation from one area of tone to another. Printing posterization from black and white requires density separations, you than print them on the same piece of paper to produce types of images on the facing page. Separations can be made by density, or color through different exposures. Density Separations can be achieved by printing three prints of the same picture at different exposure times.


Darkroom Posterization

Black and White


step 1: project the original image, leaving a wide margin for registration holes


step 2: position a sheet of lith film, test exposure, process


step 3: do the same process with three different exposure times


step 4: cut pin holes in the marigins of each print


step 5: combine them with pins


step 6: try switching around the order of the prints until you achieve the posterized look you were going for


psuedo-posterization this type of posterization has similar results to regular posterization however, you use just one sheet of high-contrast film. You then set the enlarger to the size you desire, and test print (so that shadows detail fills in) secondly you underexpose the image on lith film. Finally you place the processed film over bromide paper and expose them to light from the enlarger.


External links and sources

  • Posterization techniques

[1] [2]


Source:' Langford, Michael. The Darkroom Handbook. New York: Dorling Kindersley Limited, 1981. 245-249.


  Results from FactBites:
 
Poster - Wikipedia, the free encyclopedia (3040 words)
The great revolution in posters was the development of colour lithography which allowed the cheap printing of posters illustrated in vibrant colors.
Perhaps the most acclaimed posters were those produced by French students during the so-called "événements" of May 1968.
Poster presentations are not always peer-reviewed, but can instead be submitted, meaning that as many as can fit will be accepted, as is the case at American Astronomical Society meetings.
Poster (202 words)
Poster is a small utility for making a poster -- a large printed image -- from an EPS file or a one-page PS document.
Poster is available as an executable DOS file, and as C source code you can compile yourself.
Poster was written by Jos van Eijndhoven in 1995, and has been popular among PostScript users ever since.
  More results at FactBites »

 
 

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