Colour that matches: managing brand and product colour across screens, print, packaging and coatings

A business’s colours appear in many places: on its website, in brochures and data sheets, on packaging and labels, on vehicles and signs, and often on the products themselves, in powder-coated frames, painted panels, moulded plastic housings and printed nameplates. When those colours drift, the brand looks careless. Worse, when product colour varies between batches or between parts from different suppliers, customers notice mismatched panels on the same machine, and warranty claims and rejected deliveries follow.

Colour mismatches are not usually caused by carelessness. They happen because every screen, printing process, ink, substrate, coating and plastic reproduces colour differently, and because people judge colour under different lights and with different eyes. Matching colour across them takes a clear specification for each medium, an understanding of what each can achieve, controlled viewing and measurement, and an approval process with suppliers.

This article explains why colours differ between devices and materials, how colour is described and specified, how to manage colour on screens and in print, how to control colour on products and packaging, how colour is measured and approved, and how to set up a practical colour standard for a business. It is general information for marketing staff, product managers, engineers, buyers and quality staff.

Why the same colour looks different

Light and ink work differently

Screens create colour by emitting red, green and blue light, an additive system called RGB. Printing creates colour by laying inks on paper or other materials that absorb some light and reflect the rest, a subtractive system. Most commercial printing uses cyan, magenta, yellow and black inks, called CMYK or process colour.

Each device and process can only reproduce a certain range of colours, called its gamut. Screens can show some bright, saturated colours, especially vivid oranges, greens and blues, that CMYK printing cannot reproduce, so they look duller in print.

Materials change colour

The same ink looks different on bright white coated paper, uncoated paper, kraft board, plastic film and metal. Varnishes, laminates and coatings change gloss and colour. On products, the same nominal colour looks different in gloss, satin and matt finishes, and in smooth or textured surfaces, because texture and gloss change how light is reflected.

Lighting and observers matter

Colours change under different lighting. Two samples can match under daylight but not under warehouse LEDs or shop lighting, an effect called metamerism, common when different pigments or materials are used to achieve the same colour. People also perceive colour differently, and a small share of the population, mostly men, has some form of colour vision deficiency.

How colour is described

Several systems describe colour, each suited to a different use:

Spot colours are inks mixed to a specific colour and printed as a separate ink, giving consistent, accurate results for brand colours. Process colours build colours from the four CMYK inks, which is economical for photographs and full-colour work but cannot reproduce every spot colour.

CIELAB is the most important system for quality control, because it describes colour numerically, independent of any device, and allows differences to be measured.

Building a brand colour specification

A brand colour should not be “orange”. It should be defined for every medium in which it appears:

• A spot colour reference, with coated and uncoated versions where printing on both.
• CMYK values for coated and uncoated process printing, agreed with your printer, because the best values differ by paper and press.
• RGB and HEX values for screens.
• A coating reference, such as a RAL or AS 2700 colour or a supplier’s specific product, for painted and powder-coated items.
• CIELAB target values with tolerances, for measurement.
• Physical reference samples: printed swatches, painted panels or moulded plaques, kept in controlled storage.

Recognise that some colours cannot be matched exactly in every medium. The specification should state the best achievable match for each, chosen deliberately, rather than leaving each supplier to guess. Brand consistency also depends on how colour is used, not just the values; the building a brand on a small budget article covers consistent brand use more broadly.

Managing colour on screens

Screens vary widely in brightness, colour and gamut, so the same file looks different on different monitors.

• Calibrate monitors used for colour-critical work with a hardware calibration device, which measures the screen and creates a profile describing it.
• Use colour-managed software that applies that profile.
• Work in sRGB for web and general office use, the standard colour space for screens.
• Accept that customers’ screens vary; specify brand RGB values and use them consistently, rather than adjusting colours to look right on one uncalibrated screen.

Colour profiles, often called ICC profiles after the International Color Consortium that defined the format, describe how a device or process reproduces colour. Colour management uses them to convert colours between devices so they look as close as possible.

Managing colour in print

• Talk to the printer early about substrates, inks, spot colours and their preferred file format and colour handling.
• Soft proof on a calibrated monitor using the printer’s profile to preview how colours will shift in print.
• Request a hard proof for colour-critical jobs: a printed proof made to recognised proofing standards that predicts the final result, or a press proof on the actual material.
• Attend a press check for important jobs, approving colour on the press before the full run.
• View proofs under standard lighting. ISO 3664 defines viewing conditions for comparing prints, typically a daylight-balanced light booth, and printing standards such as the ISO 12647 series describe process control for printing.

Managing colour on packaging and labels

Packaging and labels bring their own challenges:

• Substrate: white, kraft, clear and metallic materials change colours dramatically. A white ink underlayer is often needed on clear or metallic films.
• Finishes: varnishes, laminates and coatings shift colour and gloss.
• Different printing processes, such as flexography, offset, digital and screen printing, reproduce colour differently, so labels from one supplier and cartons from another may not match without careful specification.
• Barcodes need contrast. Scanners read the contrast between bars and background, typically using red light, so bars should be dark, ideally black, on a light background. Red, orange or yellow bars can be effectively invisible to scanners. GS1, the organisation that manages barcode standards, publishes guidance on barcode colours and quality checks.

Managing colour on products

Painted, powder-coated, anodised and moulded parts are where colour mismatches become quality problems.

• Specify colour fully: reference standard, gloss level, texture and, ideally, CIELAB targets with tolerances.
• Approve master samples: physical panels or plaques from the production process and material, signed off and kept as references for supplier inspection.
• Expect material differences: matching a plastic housing to a powder-coated steel frame is difficult because pigments, gloss and texture differ. Approve them side by side under the lighting where the product will be used.
• Check for metamerism: view samples under daylight, the lighting of the customer’s environment and typical shop or factory lighting.
• Control batch variation: ask suppliers to measure batches against the master and report results; for plastics, colour is often controlled through the colour concentrate, called masterbatch, and processing conditions.
• Consider ageing: some colours fade or yellow with ultraviolet exposure; specify suitable pigments and coatings for outdoor products.

Include colour requirements in supplier inspection plans; the inspection and test plans for supplier work article explains how to build such checks into supply arrangements.

Measuring and approving colour

Visual judgement is essential but subjective. Spectrophotometers and colorimeters measure colour numerically, usually in CIELAB values. The difference between a sample and its target is expressed as Delta E, written ΔE. Several formulas exist; the CIEDE2000 formula is widely used because it better matches human perception.

Practical points:

• Agree the formula, instrument settings and tolerance with suppliers in writing.
• Typical tolerances are often in the range of about 2 to 3 ΔE units for important commercial colours, with tighter limits for critical brand colours and looser ones for less visible items. Agree what suits each case.
• Measure and view: a numerical pass does not guarantee visual acceptance, especially across materials, so combine measurement with visual approval under standard lighting.
• Record results against batches for traceability.

Judging colour visually

Instruments do not replace trained eyes, especially for texture, gloss and overall appearance. Visual checks are far more reliable when conditions are controlled:

• Use a viewing booth with standard daylight-balanced lighting and switchable alternative sources, rather than judging under whatever lights are overhead.
• Keep surroundings neutral: grey walls or booth interiors, and no brightly coloured clothing or objects near the samples.
• View at consistent angles and distances, especially for metallic and pearlescent finishes, which change with angle.
• Place samples side by side on the same plane and swap their positions to avoid bias.
• Allow eyes to adapt for a short time after moving between lighting conditions.
• Use more than one observer for important approvals.
• Screen colour inspectors for colour vision deficiency with a simple recognised test, so judgements are reliable.

Setting up a colour standard

A practical colour standard for a business includes:

1. A colour specification document listing each brand and product colour with values for every medium, tolerances and reference samples.
2. Approved physical masters stored away from light and handled carefully, replaced periodically because they also age.
3. Supplier requirements in drawings, purchase orders and specifications.
4. Proofing and approval steps for print and packaging jobs.
5. Inspection of incoming products and printed items against masters.
6. Ownership: someone responsible for maintaining the standard and resolving disputes.

A worked example

This is an illustrative example. A manufacturer of electrical enclosures uses a distinctive orange as its brand colour on powder-coated doors, printed brochures, cartons and its website. Customers comment that brochure photos look brownish compared with the products, cartons from a new supplier look red, and a recent batch of doors looks noticeably different from older stock on the same site.

Investigation. The business has only an RGB value for its website and a paint supplier’s product code. Measurements with a spectrophotometer against a retained door from an earlier batch show the new batch at about ΔE 4.5, a clearly visible difference, and the brochure orange at about ΔE 6.5 from the doors, partly because the bright orange is outside the CMYK gamut of the printing process used.

Changes.

• A colour specification is written, defining a spot colour reference, CMYK values agreed with the printer for coated and uncoated stock, the RGB and HEX values, the powder coat product with gloss level and texture, and CIELAB targets.
• A signed master door panel and printed swatches are produced and stored.
• Brochures and cartons use the spot colour for the brand orange, with press proofs approved under standard lighting.
• The powder coater measures each batch against the master, with a tolerance of ΔE 2.0, and reports results with each delivery.

Result. Subsequent door batches measure within tolerance, and the brochure and carton orange visually match the doors under daylight-balanced viewing. Customer comments about mismatched colour stop.

Applying this in an Australian business

• Define each brand and product colour for every medium it appears in.
• Use spot colours for brand-critical print and packaging where possible.
• Calibrate monitors used for colour work, and use sRGB for screens.
• Proof print and packaging with your suppliers under standard lighting.
• Specify product colour fully, including gloss and texture, with physical masters.
• Measure with instruments and agree tolerances with suppliers.
• Check under several light sources for metamerism.
• Keep barcodes high contrast.

Where colour management goes wrong

• Brand colours defined only as RGB or a paint code.
• Judging print colour on uncalibrated screens.
• Expecting CMYK print to match vivid screen colours.
• No physical masters for coated or moulded parts.
• Approving samples under one light that mismatch under another.
• Gloss and texture ignored in colour specifications.
• Low-contrast or red barcodes.

Questions to ask about colour

• Where does each of our colours appear, and is it defined for each medium?
• Which colours cannot be reproduced exactly in some media, and what is the agreed best match?
• Do we have physical masters, and are they current?
• How do suppliers measure and report colour, and to what tolerance?
• Under what lighting are colours approved and used?
• Who owns our colour standard?

Bringing it together

Colours drift between screens, print, packaging and products because each device, process and material reproduces colour differently, and because lighting and observers vary. Matching them takes a specification for every medium, from spot colours and CMYK values to RGB codes, coating references and CIELAB targets; calibrated screens and proper proofing; physical master samples; instrument measurement with agreed ΔE tolerances; and approval under controlled lighting. With a clear owner and supplier requirements, a business can keep its colours consistent across everything customers see.

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Source: KEVOS editorial notes, drawing on established colour management, print production and product finishing practice. The worked example is illustrative. This article is general information.