Lexicon

Scale colours are standardised variants of the process colours cyan, magenta, yellow and black, which were defined according to earlier fixed standards such as the ‘Euroscala’. The term refers to a colour scale that enables a colour-accurate and reproducible representation of these colours. The best-known standards for process colours are ISO 2846 (colour properties of printing inks) and ISO 12647 (standardised printing processes). The specifications of these four basic process colours ensured that printing results remained reproducible regardless of the machine, location or time. They were therefore mainly used in …

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The Scheufelen paper mill was one of the best known and most traditional paper mills in Germany for over 100 years.

The SCTV, the Spot Colour Tone Value, is a ratio of the colorimetric difference between the hue, the substrate and the solid tone. SCTV uses L*a*b* as a basis, and in the best case also spectral data, and therefore works equally well with all spot colours, printing processes and papers and delivers a consistent result. When calibrating spot colours, SCTV reliably produces a result in which the 50 % hue of the colour is visually very close to the expected 50 % appearance. In the past, defined target values for …

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