Printing data guide: CMYK or RGB?

• RGB (red, green, blue) designates the color space of the light colors, e.g. on the monitor or screen.
• CMYK (Cyan Magenta Yellow Key=Black) designates the color space of body colors, eg printed or natural colors
• Finally, all print data is always converted into the printer's target color space and thus into CMYK. The printing machine works in four-color printing with inks/pigments in the colors cyan, yellow, magenta and black.
• All common RIPs (raster graphics processor: printer control software) can process both CMYK and RGB data.
• For most print jobs, it makes sense if all image data is already converted to CMYK in prepress.
• If the largest possible color space of an LFP printer is to be achieved, the data can be supplied as (original) RGB with an embedded input profile. This is useful, for example, for photo books. This is how the largest color gamut is achieved.
• If correct and consistent color reproduction is important, then convert your RGB data to CMYK – usually to the ISO coated_V2.icc output profile. The larger RGB color space is thus adapted to the smaller CMYK color space. 
  Advantage: This color space can be achieved with almost any printing machine, whether offset or digital printing. The color impression of logo colors or corporate designs is then the same on the various advertising media.