Ch. 3: Measurement
Printer's Measurement
Standard
Paper Sizes
Standard
Paper Sizes
Terms
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- E Gauge
- a device used to measure point sizes and leading of printed type
- Type sizes
- Measurements that describe the size of printed type, commonly expressed in points
- Paper caliper
- A device used to measure paper thickness
- densitometer
- A sensitive photoelectric instrument that measures the density of colors. Reflection densitometers measure light reflected from paper and other surfaces; transmission densitometers measure light transmitted through film and other materials.
- Luminance
- The amount of light in an image
- Screen
- Used to change continuous-tone photographs into dotted haftones for printing
- pica
- A unit of measure in the printing industry. A pica is approximately 0.166 in. There are 12 points to a pica.
- Dots per inch
- Measuring units for image resolution; the number of dots a printing device can generate in one linear inch. It is also used to describe pixels per inch in a bitmapped image
- Reflection densitometer
- Instrument used to accurately determine different tone values, such as the highlights and shadows of an original
- Point system
- The system of print measurement used throughout the graphic communications industry in the United States. The standard units in the point system are the point and pica
- Paper size
- Measurements that describe the length and width dimentions of paper. Sizes are expressed in inches or metric units
- Chromaricity
- The color quality of an image
- ISO series
- the series of standard paper and envelope sizes established by the International Organization for Standardization
- Basic size
- The standard length and width, in inches, of a grade of paper
- Nonpareils
- Measuring unit on a line gauge that is equal to one-half pica. A pica is equal to 0.166"; a nonpareil is 0.083".
- line gauge
- A metal rule used by printers. Divided into Picas it is 72 picas long (11.952in).
- Ream
- Five hundred sheets of paper
- SI Metric system
- The modern version of the metric system, based on seven internationally recognized units of measure
- resolution
- The measurement used in typesetting to express quality of output. Measured in dots per inch, the greater the number of dots, the more smoother and cleaner appearance the character/image will have. Currently Page (laser) Printers print at 300, 406 and 600dpi. Typesetting machines print at 1,200 dpi or more.
- Transmission densitometer
- Color measurement device that measures the fraction of incident light conveyed through a negative or positive transparency without being absorbed or scattered
- proportional scale
- a measuring device used to determine the correct reproduction percentage for the enlargement or reduction of images
- Grayscale
- A continuous tone strip used to visually gauge exposure of an image
- Spectrophotometer
- Instrument capable of measuring light of different colors or wavelengths
- point
- Unit of thickness equals 1/1000 inch. In typesetting, unit of height equalling 1/72 inch. Point size is the measured from the top of the ascender to the bottom of the descender.
- Basis weight
- The weight, in pounds, of a ream of paper cut to its basic size
- US Conventional system
- The standard system of weights and measures used in the United States
- screen tint
- Area of image printed with dots so ink coverage is less than 100% and simulates shading or a lighter color.
- screen angles
- Angles at which screens intersect with the horizontal line of the press sheet. The common screen angles for separations are black 45 degree, magenta 75 degree, yellow 90 degree and cyan 105 degree.