(Continued from previous issue)
Edge of paper left ragged as it comes from the papermaking machine instead of being cleanly cut. Also called Feather Edge.
Chemical process of reproducing line copy and making halftone positives ready for paste-up.
Dot created by a computer and printed out by a laser printer or imagesetter. Digital dots are uniform in size, as compared to halftone dots that vary in size.
When halftone dots print larger on paper than they are on films or plates, reducing detail and lowering contrast. Also called Dot Growth, Dot Spread and Press Gain.
To print a single image twice so it has two layers of ink.
Double Dot Halftone
Halftone double burned onto one plate from two halftones, one shot for shadows, the second shot for midtones and highlights.
Blurring or shadowing of an image when printed. Doubling may be caused by problems with paper, cylinder alignment, blanket pressures or dirty cylinders.
Printed ink colours become less dense as the ink dries.
To press an image into paper so it lies above the surface. Also called Cameo and Tool.
Sheet that attaches the inside pages of a case-bound book to its cover. Also called Pastedown or End Papers.
Halftone in one ink colour printed over screen tint of a second colour. Also called Dummy Duotone, Duplex Halftone, Flat Tint Halftone and Halftone with Screen.
Fast Colour Inks
Inks with colours that retain their density and resist fading as they’re used.
Side of the paper that was not in contact with the Fourdrinier wire during papermaking, as compared to wire side.
Refers to the thickness of a film. The most common gauge for graphic arts film is 0.004 inch.
Papers made specifically for writing or commercial printing, as compared to coarse papers and industrial papers. Also called Cultural Papers and Graphic Papers.
Screen with ruling of 150 lines per inch or more.
To print a sheet completely with an ink or varnish. Also called Painting the Sheet.
Used to make type more legible by lowering the density of an image while allowing it to show through.
Roller(s) that come in contact with the printing plate, bringing it ink or water.
Mixture of water and chemicals that dampens a printing plate to prevent ink from adhering to the non-image area. Also called Dampener solution.
Paper made from cooked wood fibres mixed with chemicals and washed free of impurities. Also called Woodfree Paper.
Halftone ranging from 0% coverage in its highlights to 100% coverage in its shadows.
Black separation with dots throughout the entire tonal range of the image. Also called Full-Range Black.
Chemical ghosting is the transfer of a faint image from the front of one sheet to the back of another. Mechanical ghosting refers to the faint image appearing as a repeat of an image on the same side of the sheet. Or, a printed image appearing too light because of poor ink coverage.
Term used to distinguish printing papers, but it can also refer to the category, class, rating, finish or brand of paper.
Grain Long Paper
Paper whose fibres run parallel to the long dimension of the sheet. Also called long grain paper and narrow web paper.
Graphic Arts Film
Film that yields high-contrast images suitable for reproduction by a printing press, as opposed to continuous-tone film. Also called Litho Film and Repro Film.
Approximately 1/8 inch along the spine of a book that is ground off gathered signatures before perfect binding.
Usually newsprint made from pulp created when wood chips are ground mechanically rather than refined chemically.
A faint shadow that surrounds printed halftone dots. Also called Halation and Fringe.
Colour that uses 6, 8 or 12 separations, as compared to 4-colour process.
Abbreviation for hue, lightness and/or saturation. It’s one of the colour-control options often found in software for design and page assembly. Also called HVS.
When a piece of dirt or an air bubble causes incomplete draw-down during platemaking, leaving an area of weak ink coverage or visible dot gain.
The relationship of densities and dot gains of process inks to each other and to a standard density of neutral gray.
When a paper absorbs ink poorly, drying on its surface. Also called Holdout.
Printing on surfaces with two levels, having inked areas lower than non-inked areas – such as gravure and engraving. Also called Recess Printing.