Point 

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See Point System and Point Size. In papermaking and in binding and finishing, one point equals one thousandth of an inch. Thus, binder’s board having a thickness of 80 points is 0.080 inch …

Pointillism

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In digital mage manipulation, a special effect which transforms a continuous tone image into small dots. Essentially, dots of pure colors are placed adjacent to each other, the viewer perceiving that various …

Porosimeter 

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A device used to measure the porosity of a paper by measuring the rate of the flow of air through a paper sample. See Sheffield Porosimeter.

Porosity 

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A measure of the extent to which a paper surface will allow the penetration of a gas or liquid, such as air or ink, through its surface. The nature of …

Posterization 

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The conversion or reproduction of a continuous tone image to one with only a few distinct tones, or having a flat, poster-like quality. When images are posterized photographically, high-contrast film is used …

Posterize 

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To impart to an image the effect of posterization. See Posterization.

PostScript Level 1 

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The original version of the PostScript page description language, created by Adobe Systems, Inc. However, PostScript Level 1 was not actually called that until the release of PostScript Level 2 in 1991. See PostScript.

PostScript Level 2 

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A revision and re-release of Adobe Systems’ popular page description language, which among other things provided support for process color output, in particular defined color spaces and algorithms for the data compression of color images. See PostScript.