Establishing a Colour System: How to Define Colour Tolerances with Spectrophotometric Technology

Colour measurement plays an important role in nearly every application of every industry. Colour variations are a part of human perception, but the ability to clearly identify these differences and establishing colour parameters is an important part of a colour system that works. Image Source: Flickr user frankieleon

Colour measurement may seem pretty straightforward at first glance, but due to the limitations of the human eye, instrumental colour measurement tools soon become a necessity for creating consistent and repeatable colours. Colour quality plays a huge role in nearly every industry, and setting up a colour system based on advanced colour measurement instrumentation can make a difference in product quality and appearance. Although setting up a colour system may seem tedious and difficult at first, especially with all the bells and whistle of today’s spectrophotometers, with the right support these steps will definitely pay off in the long run. Implementing a colour system is not only important for identifying colour measurement standards, but clearly defines colour tolerances as well, which is the key in creating a system that works.

Spectrophotometric technology allows you to create an effective colour system with a method for monitoring that system which can save time and money. A good colour system first begins with identifying colour variations. These variations or differences are commonly referred to as Delta-E. Delta-E (dE) expresses “the ‘distance’ between two colours” and can be represented in numerical form using colour measurement data. A dE value of 1.o represents the smallest measurement of colour difference that can be perceived by the human eye. Anything less that dE 1.0 will appear to be the same colour no matter who is viewing the sample and is not affected by angle or light source. A dE measurement slightly above 1.0 usually goes unnoticed by the average viewer and can be considered an ‘acceptable’ colour difference, but establishing these boundaries with an effective colour system is a fundamental element in quality control and production efficiency. This range of acceptability is defined as a colour tolerance and is a foundation in establishing an effective colour system.

Catching colour variations early

Advanced spectrophotometric technology can measure Delta-E levels that are impossible to identify with the human eye. Despite the fact that these slight differences are often overlooked by the average consumer, as the dE values increase the effects soon become apparent. This often results in both timely and costly recalculations and wasted materials. Advanced spectrophotometers offer quantifiable data that can be used to ‘catch’ these slight colour variations in their infancy and can prompt quick and effective recalibration to ensure colour quality and product acceptability. When specific colour tolerance levels are established as part of a colour system, the results lead to a higher quality product, better production efficiency, and a larger profit.

Variations in lighting and angle can affect colour perception making instrumental colour analysis an important part of colour quality control. Image Source: Flickr user sonictk

The “close enough” approach to colour-matching

Colour-matching plays an important role in many industries where colour is often the first impression that influences consumer choice. When establishing a tolerable level of colour variation in product appearance, it is often up to the customer to deem what is acceptable or not. When colour expectations are not met, a product is often rejected, and both time and money is wasted. Knowing the exact tolerance and expectation standard a product must reach is essential for creating a colour system that works. With spectrophotometric technology, these variations can be quantified and represented by a numerical value that states an acceptable range of colour difference base on both the product and customer need. This data is then stored as part of a colour system that can be reproduced effectively during the production phase, rather than making costly changes later on.

Colour-matching is an important part of product development. Various shades and hues of colours can vary slightly and individual perception often varies greatly, making the need for subjective colour measurement an important part of a colour monitoring system. Image Source: Flickr’ user Andrew Tarvin

Establishing an effective colour system

Setting up an effective colour system requires precise instrumentation that can be adapted to meet the specific needs of your industry. At HunterLab we offer unique colour measurement tools that can be designed to meet the needs and challenges of colour matching and provide the data needed to develop appropriate colour tolerance levels. With expert help and unsurpassed customer support, HunterLab can make the process of developing a colour system both stress-free and highly effective. Contact HunterLab today to learn more about how we can help you set the standards in colour measurement.