flexography
See flexo.

flooding
Excessive ink from the printing plate or blanket.

flop
To turn an image so that the left side is on the right side, and the right side is on the left side. The top-bottom orientation remains unchanged.

flush left
A block of text set so that each line begins at the same left hand point, but ends at different right hand margin.
flush right
Typeset lines with an even margin on the right, but uneven on the left.

FM
Abbreviation for Frequency Modulation.

FM
Abbreviation for Front Matter.

Focoltone
A colour matching product that utilizes an array of printed colour swatches. Focoltone is used to specify process colour.
focus
- A point in an optical system through which all light rays pass.
- The act of adjusting the elements of an optical system to capture the sharpest image with the most detail.

fold marks
Short, straight (usually broken) lines outside the trimmed area indicating the position of intended folds.

folder
A file program organization method in which individual files and programs are stored within folders, making it easier to keep them organized on a disk.

folio
- A page number.
- A sheet of paper folded once to form two leaves.
- The size of each of the two leaves formed from a folio.
- A book format in which a folded sheet forms two leaves; also a book in this format.
- A book of the largest size.

font
A collection of glyphs (character shapes) used for the visual depiction of character data.

foot candle
A standard unit of illumination, the light given off by one lit candle measured at a distance of one foot. For example, the illumination level in a standard viewing booth is 200 foot candles.

format
- An exact geometric arrangement of organization of file data or computer command codes.
- (verb) To prepare a magnetic floppy disk so that data can be stores in it.
- The shape, size, type area, margins and overall visual design and appearance of a page, book, magazine and or other publication.
- The arrangement or sequence of typesetting parameters and commands into format codes that can be assessed with a simple keyboard command or keystroke.

fountain
See blend.

FPO
Abbreviation for For Position Only.
- On a mechanical, a designation that an image has been added only to indicate its position within the layout. The artwork or transparency to be reproduced in the same position is sent separately.
- Nowadays an FPO is a small low resolution image that is used to indicate the position of a larger image.

frame buffer
A video monitor card that is used to store a single frame from a video image.

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