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Below is a list of RAL Classic colours [1] from the RAL colour standard. Alongside every colour, the corresponding values are given for: hexadecimal triplet for the sRGB colour space, approximating the given RAL colour; sRGB value; Grey value calculated from (0.2126 × red) + (0.7152 × green) + (0.0722 × blue) [12] CIE L*a*b* values
RAL is a colour management system used in Europe that is created and administered by the German RAL gGmbH [1] (RAL non-profit LLC), which is a subsidiary of the German RAL Institute . In colloquial speech, RAL refers to the RAL Classic system, mainly used for varnish and powder coating , but now plastics as well.
The CMYK color model (also known as process color, or four color) is a subtractive color model, based on the CMY color model, used in color printing, and is also used to describe the printing process itself. The abbreviation CMYK refers to the four ink plates used: cyan, magenta, yellow, and key (most often black).
CMYK is used in the printing process, because it describes what kinds of inks are needed to be applied so the light reflected from the substrate and through the inks produces a given color. One starts with a white substrate (canvas, page, etc.), and uses ink to subtract color from white to create an image.
CMYK uses subtractive color mixing used in the printing process, because it describes what kind of inks need to be applied so the light reflected from the substrate and through the inks produces a given color. One starts with a white substrate (canvas, page, etc.), and uses ink to subtract color from white to create an image.
The most noticeable result of using light cyan and light magenta inks is the removal of a distinct and harsh dither dot appearance in prints that use light shades of cyan or magenta produced with only the CMYK inks. Usually when printing a dark color the printer will saturate an area with colored ink dots, and conversely, for a light color it ...
ISO 15930-1:2001 Graphic technology – Prepress digital data exchange – Use of PDF. Part 1: Complete exchange using CMYK data (PDF/X-1 and PDF/X-1a) (ISO TC130) ISO 15930-3:2002 Graphic technology – Prepress digital data exchange – Use of PDF. Part 3: Complete exchange suitable for color managed workflows (PDF/X-3) (ISO TC130)
Unlike the RGB and CMYK color models, CIELAB is designed to approximate human vision. The L* component closely matches human perception of lightness, though it does not take the Helmholtz–Kohlrausch effect into account. CIELAB is less uniform in the color axes, but is useful for predicting small differences in color.