Relative colorimetric

“Relative Colorimetric” is one of four rendering intents in gamut mapping.

The white point of the original colour space is adjusted to that of the destination colour space, and all other colours are also shifted in relation to it. Colours that lie outside the destination colour space are moved to its edge (clipping).

This method is particularly suitable for achieving the most accurate colour reproduction possible when converting from CMYK to CMYK, or even from less saturated RGB images to CMYK, as long as the colour spaces are of similar size.

Rendering intent

In gamut mapping, the rendering intent (rendering priority) is the strategy by which colours are converted from one colour space to another.

Depending on the CMS, e.g. by Adobe or Apple, the rendering intents can differ slightly, as they are not standardized.

There are four types of rendering intents, defined by ICC:

  • Perceptual
  • Saturation
  • Absolute Colorimetric
  • Relative Colorimetric


RGB stands for red, green and blue. Human colour vision is based on these colours.

Computer monitors and televisions each have red, green and blue light-emitting areas. If all three colours are turned on, we see white light. If all three colours are turned off, we see black.

The RGB colour system is based on additive colour mixing and used for self-luminous systems like monitors, etc..


A RIP is a raster image processor.

A RIP is normally understood as a software, sometimes also a hardware or a software / hardware combination, that converts Postscript or PDF data of a page description language into raster points or image files that a “imagesetter” can expose to a plate, film or a proof output.


The Roman16 test images are a collection of images specifically photographed for testing colour management applications, published by the Bundesverband Druck- und Medien (bvdm) which is the German Printing and Media Industries Federation. The images are available as a single package or as part of the Altona Test Suite.

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