Colorimeter vs spectrophotometer
Both instruments measure colour, but in different ways and with different accuracy. We explain the differences and help you choose the right one for your application.
Two instruments, two approaches to colour
A colorimeter and a spectrophotometer both measure colour objectively, but they work differently. A colorimeter measures colour in three channels (tristimulus X, Y, Z) through filters that mimic the sensitivity of the human eye — it outputs ready colour coordinates and the ΔE colour difference. A spectrophotometer measures the full reflectance curve across the visible range (typically 400–700 nm at 10 nm steps) and only then computes colour coordinates for any illuminant and observer.
This difference has practical consequences. A colorimeter is fast, simple and affordable — great for batch-consistency control against a single standard under fixed conditions. A spectrophotometer is more accurate and versatile — it lets you build recipes, detect metamerism (colours that look alike under one light but differ under another) and work with difficult colours (metallics, fluorescence).
When a colorimeter is enough
- Fast “pass/fail” control on the production floor against a standard
- Repeatable conditions and a single light source
- A limited budget and a need for simple operation
For such tasks, the NR- and NH-series colorimeters are a good fit.
When you need a spectrophotometer
- Creating and controlling colour recipes
- Assessing metamerism and working under different illuminants
- The highest accuracy and inter-instrument agreement
- Difficult colours: metallic, pearlescent, fluorescent, liquids
Then choose a spectrophotometer with a full reflectance curve and SCI/SCE modes. In practice many laboratories use both: a spectrophotometer in the recipe lab and a colorimeter for fast checks on the floor.
Frequently asked questions
Does a colorimeter measure ΔE the same as a spectrophotometer?
A colorimeter reports ΔE against a standard under fixed conditions and is sufficient for simple batch control. A spectrophotometer is more accurate, however, and can compute ΔE for different illuminants and detect metamerism, which a colorimeter cannot see.
Can a spectrophotometer replace a colorimeter?
Functionally yes — a spectrophotometer computes the same colour coordinates as a colorimeter. Because of cost and simplicity, though, many plants keep a colorimeter for fast production-floor checks and a spectrophotometer in the lab.
Which instrument should I start with?
If you control conformity to a single standard under fixed conditions — a colorimeter. If you build recipes, work under different light or with difficult colours — a spectrophotometer. We are happy to help you choose a model for your application.