To identify the percent by which images should be enlarged or reduced.

Alternate term for Proportional scale.

Electronic device used to make color separations and sometimes halftones and duotones.

To compress paper along a line so it will fold more easily.

Piece of film with dots of uniform density, used to make plates that will print screen tints. See also Halftone screen.

Amount of ink, expressed as percent of coverage, that a specific screen allows to print.

Method of printing by forcing ink through a mesh stencil.

The number of rows or lines of dots per inch in a screen for tint or halftone.

Area of image printed with dots so ink coverage is less than 100% and simulates shading or a lighter color.

To scratch lines into emulsion of a negative.

Undesirable thin film of ink covering non-image area of printed sheet,