Glossary of print, I. Imagesetter, ISO paper sizes.

Print, paper and printing technology terms and definitions beginning with the letter I.

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Imagesetter

Digital output device for creating films for offset-litho printing. Digital files are output in a similar way to normal laser printing, but printed as separations for high-quality reproduction.

Imagesetters can have output resolutions of up to 5000dpi although 12000 dpi is more the norm for mono printing and 24000dpi to 36000 is generally acceptable for basic CMYK color work.

See also: Platesetter

ISO paper sizes

European standard paper size standard. The most common of which is the 'A' series. The aspect ratio of ISO paper sheets is 1 to 1.414. This means that if you cut a sheet into halves they will be the same proportion as the original. In other words a sheet of A3, when cut in half, will give two sheets of A4.

There are are also B and C size papers and the larger RA and SRA paper sizes, which are allow printers to print oversize sheets that can be trimmed to 'A' size for commercial use.