Color-Separations  –  from CMYK to Spot-Color-Separation

All the colors the human eye is able to perceive are stimulated by combinations of electromagnetic waves. Their wave lengths are ranging from 380 to 780 nm and are called „the spectrum of light“.

For a print-reproduction of colors there are inks of two different characteristics available:  Reflective – Opaque & Transmitting – Transparent. Most computer monitors, scanners, cameras and beamers are based on Additive-Light-Mixing, on RGB.  Prints on paper or other opaque substrates are mainly based on Substractive-Light-Mixing, mostly CMYK.  To ensure a proper conversion between those systems, calibrated inks and color-conversion-tables are built into systems like office-printers. Professional printing systems deserve more flexibility according to the different surfaces, inks and higher performances they do have to match.

CMYK-inks are based on organic pigments or dyes. Within a temperature below 200ºC almost any color can be generated. Firing temperatures between 500ºC and 700ºC deserve very high sophisticated inorganic, ceramic pigments. In this range of ceramic-pigments most colors that fundamental for CMYK-processing are almost impossible to be attained. Therefore it is necessary to work with special color-separation-systems that are compensating the missing tones to fill the gaps. This systems have to be optimized for each artwork individually to obtain the highes performance possible.

The GlassJet is working with many prepress separation solutions that can be adapted to the necessities of the CDP. For an easy CDP-separation DipTech is providing a special separation software that is called DXP.

More specialized separation and software solutions can be prepared by HoffmannGTD on request.

ColorAnalytics on RGB-image

Cerdip-ColorCube color-analysis-software

a typical set of special Cerdip-Color-Separations

RAL-Color-distribution in a RGB-color-space Cerdip-ColorCube color-analysis-software


  1. Dear Sir
    we are glass and porcelain decorating company from Croatia. We are interested if DXP software can help us in separation for glass decoration (600 C)

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