Rich black

Fat Black (english rich black) describes a special feature of the CMYK printing ( color printing ). In order to obtain fat black generally the amount of black or a portion of 60-80 % C (Cyan) will be added, so that a paint applicator of 160 to 180 % is formed of 100 % K (Key). So just a deep black, strong, brilliant, opaque black is achieved with higher color density. This black and should be applied only where registration problems are to be expected - the black for text, it is not suitable; all the more likely when there is background Fund.

Variants

Fogra Research Association sees eg in their color tables for printing processes according to ISO 12647-2:2004 Class 1 in the paper a total of 32 different blends of 100 % Key with the other three colors of the CMYK color model before. Depending on the strength of the under color removal or The Gray Component result in the separation of digitized image data such different blacks, which is also known as Under Color Addition ( UCA). A special situation in which all the basic colors of the color model may be used to 100%, forming the pass color.

Optimal Black

Usually all four process colors need to be mixed for optimal shade of black. When choosing the exact composition Schabloniereffekte, trapping and the delay must depending on the printing process, are considered. Package values ​​can be regarded as the first clue. Also note that some printers limit in its guidelines on data delivery the maximum of paint to values ​​well below 400%.