# RGB Colour

> [!note] Ta strona nie została jeszcze przetłumaczona i jest wyświetlana w języku angielskim.


**RGB Colour** records the basic colour information of the surface image as three separate channels: red (R), green (G) and blue (B).

## Parameter description  
RGB Colour describes the appearance of the surface in terms of its digital image colour values rather than in a colour‑space such as CIELab. Each pixel in the observer‑camera image has an R‑G‑B triplet; the reported RGB Colour values are the average red, green and blue channel intensities over the analysed area, giving a simple numerical description of surface shade and tone.

## How is it measured?  
- The observer camera captures a colour‑corrected image of the surface using 45° circumferential illumination and 0° observation geometry.  
- Software averages the red, green and blue pixel values within the defined measurement area (for example 18 × 9 mm), reporting three numbers: R, G and B. These values can be trended, compared between batches or exported for further colour analysis.

## Interpretation of values  
- Higher R values indicate a stronger red component, higher G values a stronger green component, and higher B values a stronger blue component in the surface colour.  
- Changes in RGB channel balance over time or between samples indicate colour drift, contamination, ageing or process variation, even when gloss and texture remain constant.

## Applications  
- Monitoring batch‑to‑batch colour consistency of coatings, plastics, inks and decorative films alongside gloss, haze and texture metrics.  
- Quickly flagging visible colour shifts on production lines or during development trials without needing a dedicated spectrophotometer, and documenting the appearance of standards, master panels and reference parts in quality systems.

## Technical Specification


| Item                      | Specification / Value                                                                                  |
|---------------------------|---------------------------------------------------------------------------------------------------------|
| Index names               | R, G, B                                                                                                 |
| Description               | Average red, green and blue channel intensities from the surface image                                 |
| Units                     | 0–255 (8‑bit channel values) or normalised 0.0–1.0, depending on software configuration                |
| Measurement geometry      | 45° circumferential illumination, 0° observation (observer camera)                                     |
| Field of view (FOV)       | Dependent on module                                                                                              |     |
| Measurement principle     | Capture of a colour image, followed by spatial averaging of R, G and B pixel values over the region    |
| Measurement range         | Full sensor range for each channel (typically 0–255)                                                   |
| Repeatability (typical)   | Within ±1–2 channel                                       |
| Reproducibility (typical) | Within ±3–5 channel counts after re‑positioning and re‑measurement                                     |
| Primary use               | Tracking colour/shade changes and documenting appearance alongside gloss, haze and texture parameters  |