Anyone working with color soon runs into terms like RGB, CMYK, Pantone, HKS, RAL and Lab. Each of these color spaces has a clear purpose – and mixing them up leads to disappointing results. This guide sorts the systems out in plain terms. To convert quickly between them, use our Professional Color Converter.
RGB and CMYK: additive versus subtractive
RGB stands for Red, Green and Blue. It is an additive color space: light sources mix to white when all channels are at full brightness. RGB underlies every self-illuminating medium – monitors, smartphones, TVs – and is the basis for web colors, usually written as a HEX value (e.g. #FF6600).
CMYK stands for Cyan, Magenta, Yellow and Key (black). It is a subtractive color space: printing inks absorb light, so the more ink is applied, the darker the result. CMYK is the standard for four-color printing on paper, packaging and flyers.
Why screen ≠ print
The key reason for differences is the differing gamut – the range of reproducible colors. A screen can show bright, saturated RGB colors that cannot be reproduced 1:1 with four printing inks. Especially vivid greens, oranges and blues often look duller in print. That is why print files should be checked in CMYK mode before approval.
| Color space | Principle | Use |
|---|---|---|
| RGB | additive (light) | Screen, web |
| CMYK | subtractive (ink) |
Pantone and HKS: spot colors for the brand
Pantone (PMS) and HKS are systems for spot or solid colors. Unlike four-color printing, they use a pre-mixed ink that reproduces exactly and repeatably. That is precisely what logos and corporate design need: a brand should look identical on a business card, a brochure and a vehicle wrap.
- Pantone is widely used internationally and communicated through fan decks with defined color numbers.
- HKS is established mainly in German-speaking markets and covers common print requirements.
A converter provides reliable approximations when moving between these systems and CMYK or RGB. To combine different tones, try the Color Mixing Simulator.
RAL: the standard for paint and construction
RAL is the common system for standardized colors in paint, industry and construction. Window frames, facades, machines or railings are ordered and produced unambiguously via RAL numbers. The benefit: tradespeople, manufacturers and clients speak the same language, regardless of supplier. For graphics and screens, RAL is unsuitable because it is designed for physical coatings.
Lab (CIELAB): the device-independent reference
Lab or CIELAB is a device-independent color space. It describes colors regardless of monitor, printer or paint and therefore serves as a reference and conversion hub between the other systems. The color difference between two tones is measured as ΔE (Delta E): the smaller the value, the more similar the colors. In quality control it shows whether a production color still matches the specification.
Which color space for what? The rule of thumb
For everyday use the choice is easy to summarize:
- Web and screen: RGB / HEX
- Print on paper: CMYK
- Logo and brand color: Pantone / HKS
- Paint and construction: RAL
- Reference and comparison: Lab with ΔE
This avoids nasty surprises between draft and result. You can convert concrete values any time with the Professional Color Converter.
