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The back of a bound book connecting the two covers: also called spine.
Back Slit:
Linear cuts put in the liner while on press to meet specialized end use requirements.
Backing Up:
Printing the reverse side of a sheet already printed on one side.
Bad Break:
In composition, starting a page or ending a paragraph with a single word, or widow.
A visible stair stepping of shades in a gradient.
In optical reading, a binary coding system using bars of varying thickness or position in the encoded field.  The codes are normally machine printed.
Imaginary line on which the upper and lowercase letters of a font sit, only descenders extend below it.
Basic Size:
In inches, 25 x 38 for book papers, 20 x 26 for cover papers, 221/2 x 281/2 or 221/2 x 35 for bristols, 251/2 x 301/2 for index.
Basis Weight:
The weight in pounds of a ream (500 sheets) of paper cut to a given standard size for that grade; e.g., 500 sheets of 25" x 38", 80-lb. coated book paper weigh 80 pounds.
In presses, the flat surfaces or rings at the ends of cylinders that come in contact with each other during printing and serve as a basis for determining packing thickness.
Bezier Curve:
In object-oriented software programs, a curve whose shape is defined by anchor points set along its arc.
Bimetal Plate:
In lithography, a plate used for long runs in which the printing image base is usually copper and the nonprinting area is aluminum, stainless steel, or chromium.
(Binary digit) In computers, the basic unit of digital information; contraction of BInary digiT.
Bit Depth:
The number of bits used to define a devices capability of reproducing colors.
An image formed by a rectangular grid of pixels.  The computer assigns a value to each pixel, from one bit of information for black or white, to as much as 24 bits per pixel for full-color images.
Bit-Mapped Grapics:
The graphic is stored as a map of dots.  If you double the size of the graphic, you double the size of the pixel, making the object appear ragged.
Originals or reproductions in single color, as distinguished from multicolor.
Black Printer:
In color reproduction, the black plate, made to increase contrast of dark tones and/or make them neutral.
In offset printing, a rubber-surfaced fabric that is clamped around a cylinder, to which the image is transferred from the plate, and from which it is transferred to the paper.
An extra amount of printed image that extends beyond the trim edge of the sheet or page.
Blind Image:
In lithography, an image that has lost its ink receptivity and fails to print.
An image enlargement.
Blown-On Labels:
A method of label application that uses air pressure to remove a label from the carrier and position it on a substrate.
In offset lithography and photoengraving, a photoprint made form stripped-up negatives or positives, used as a proof to check position of image elements.
In inkmaking, a term referring to the viscosity, or consistency, of an ink (e.g., an ink with too much body is stiff).
Body Type:
A type used for the main part or text of a printed piece, as distinguished from the heading.
Bold-Face Type:
A name given to type that is heavier than the text type with which it is used.
Bond Paper:
A grade of writing or printing paper where strength, durability and performance are essential requirements; used for letterheads, business forms, etc. The basic size is 17" x 22".
Book Paper:
A general term for coated and uncoated papers.  The basic size is 25" x 38".
Bounding Box:
An invisible box defining the edges of an item in some applications.
Break for Color:
In artwork and composition, to seperate the parts to be printed in different colors.
A tear in a fanfolded stack of pressure sensitive labels.
In photography, light reflected by the copy.  In paper, the reflectance or brilliance of the paper.
A pamplet bound in booklet form.
Printing with a sizing ink, then applying bronze powder while still wet to produce a metallic luster.
The degree of thickness of paper.  In book printing, the number of pages per inch for a given basis weight.
Bulletin Boards:
These are computer systems to which other computers can connect so users can read and leave messages or retrieve and leave files.  Often, there's a charge to use them.
Bump Exposure:
In photography, an exposure in halftone photography, especially with contact screens, in which the screen is removed for a short time.  It increases highlight contrast and drops out the dots in whites.
In platemaking, a common term used for a plate exposure.
A mechanical device used to separate cross-web perfs at intermediate locations between labels.
A series of wires or paths along which information is shared within a computer or between one device and another.
To adjoin without overlapping, as, for example, two pieces of film or two colors of ink.
Butt-cut Labels:
Labels separated by a single knife cut through the face material. No matrix is removed between labels.
In computers, a unit of digital information, equivalent to one character or 8 to 32 bits.
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