OUGD504 - SB01 - Printing Terms

OUGD504

SB01

Printing Terms

Colorimetre

A colorimeter is a device used for measuring the intensity and hue of the light emitted from a computer monitor. The instrument sits flat on the screen, and has a light-reading cell in its underbelly. This information is analysed to build a profile that calibrates the monitor.

DPI

DPI stands for dots per inch. A higher DPI is better.

DPI values don't compare across technologies. Inkjets typically print at around 700dpi for basic proofing, 1440dpi for typical output and 2560dpi for very high quality. Higher DPI values are slightly smoother, but take longer to print and use more ink.

Dye-based ink

Dye-based inks stain media directly rather than printing on a substrate, and are often water-soluble. Colours are brighter than for pigment inks, but they fade faster. Dye-based inks are often used for photo printing, and sometimes for proofing.

Dye sublimation

'Dye-sub' is an alternative printer technology used for fabric printing and other specialised applications. Some inkjet models, especially those by Epson, can be used with dye-sub inks. Prints can be made directly onto fabric or transfer paper, and then fixed into the fabric with a heat press.

Large format

Also known as 'wide format', these are big industrial printers. Smaller units print up to A2 on sheets or rolls; the largest models print on rolls up to 64 inches wide. Prices range from around £2,000 to more than £20,000. They typically use the same technology as desktop printers, but are bigger and should be more reliable.

Pantone Coverage

This is a measure of how accurately a printer can reproduce the standard Pantone swatch colours. Modern printers can output 98 per cent of the Pantone range. This is good enough for accurate proofing, but this range also depends on the paper used.

Pigment Based inks

Most inkjets use pigment-based inks, with up to 12 distinct colours. Pigment inks are used for archival art printing, and for black-and-white or lightly toned colour photography. Colours tend to be less saturated than dye-based output, but are more resistant to UV light and fading.

RIP

Raster Image Processor - a software accessory that works as an enhanced printer driver, producing the highest possible quality output for text, bitmap graphics and vector art. An RIP isn't essential, but it's a useful add-on for large format work.

Solid ink

Ink supplied in solid form and melted into a wax before printing. Mostly used by Xerox, it's good for quick office output and basic proofing, but not so much for art or photo printing. Large format versions used to be available, but are difficult to find now.

Solvent Inks

Used by Epson in its largest uber-expensive GS6000 model, these are effectively dye-based inks with enhanced UV stability for printing on fabric, vinyl and canvas. Like other dye-based inks they soak into and stain the medium they're printed on.

Cut sizes

The smaller sizes of paper, such as A4, derived by cutting down the 'parent' sizes used by commercial printing presses.

Finish

The feel and texture of any paper. Laid finish is machine-made paper that emulates handmade; embossed finish presses a pattern into the surface of the paper; matte papers have a dull surface well-suited to text

Trim size

The dimensions of a printed page after any excess edges have been cut away. 

Saddle stitching

The process of folding sheets in half, with staples or stitching in the middle. The page count must be divisible by four.

Perfect binding

Sounds a lot more glamorous than it is: a paper block is glued into a wrap-around cover, just like in a regular paperback book. PUR binding is a variant on this that uses extra-strength, temperature-resistant glue.