A colour seen on a screen may not look the same on a burger box, kraft bag and paper cup. This is not always a printing error: screens emit light while packaging reflects it, and paper shade, coating, ink and print process all influence the result. Colour consistency therefore involves more than adding a code to the artwork and sending it to production. The colour target, packaging substrate and acceptable production variation need to be agreed before the print run begins.
Define the true reference for every brand colour
Logo files can contain different RGB, HEX, CMYK or Pantone definitions for what appears to be the same colour. If production teams do not know which value takes priority, each packaging format may receive a different interpretation. The brand guide should state the print colour system, coated and uncoated references where relevant and the primary standard to follow.
A HEX value is intended for digital use and is not enough to guarantee a printed result. Keep a physical colour sample, approved pack or current colour-guide reference as the main visual benchmark whenever possible. Repeat orders can then be assessed against something more reliable than a monitor image.
- RGB and HEX values for digital use
- Defined CMYK percentages for process printing
- Pantone references for coated and uncoated stocks where needed
- Approved physical sample and approval date
Choose Pantone or CMYK according to the artwork
Spot colours such as Pantone use a separately prepared ink and can offer strong control for flat, critical brand areas. CMYK builds colour from four process inks and is more flexible for photographs, multi-colour illustrations and gradients. Some bright or highly saturated brand colours, however, cannot be reproduced with the same intensity inside the CMYK gamut.
Using spot colour for every job or converting every design to CMYK is not a universal rule. Consider the number of colours, press capability, order quantity, packaging family and level of brand sensitivity together. A production may also combine a spot logo colour with CMYK imagery when the press and budget allow.
- Spot colour for flat and critical brand tones
- CMYK for photographs and complex multi-colour graphics
- Separate review for metallic, neon or highly saturated colours
- Impact of colour count on plates, setup and production cost
Treat paper shade and finishing as part of the colour
The same ink looks different on white coated board, natural kraft and PE-coated paper. Kraft's brown base can mute light colours, while an absorbent uncoated stock may make ink appear flatter. Varnish, lamination and barrier coatings can alter gloss, contrast and perceived saturation.
Proof on the intended production material and finish whenever possible. If the design needs a clean white foundation on kraft, an opaque white underprint or a different substrate may be required. The decision should not be based only on a screen mock-up.
- Paper whiteness and natural base shade
- Ink absorption and surface texture
- Effect of varnish, lamination or barrier coating
- Colour appearance around folds and creases
Approve proofs and samples under controlled light
A digital soft proof is useful for checking layout and overall colour relationships, but it does not fully predict ink on the final material. Request a proof or production sample relevant to the intended print process for critical brand colours, and document exactly what the approval covers.
Judging colour alternately in daylight, warm office lighting and cool warehouse light can produce conflicting decisions. Compare the new print with the approved sample side by side under consistent, neutral lighting whenever possible. Allow for the drying or curing period recommended by the printer because wet ink and freshly applied finishes may look different.
- Calibrated display and clearly identified proof type
- Neutral, repeatable viewing light
- Side-by-side comparison with the approved sample
- Sufficient wait for wet-to-dry colour change
Agree the acceptable colour difference before production
Zero colour difference is not a practical print target. Material batches, ink density, press settings and finishing can introduce small changes. The important step is to avoid leaving the acceptable range undefined. Critical brand colours and secondary graphic areas may need different levels of control.
Spectrophotometer readings using L*a*b* and Delta E can support visual inspection with objective data. A number alone is not enough: measurement condition, instrument setting, backing, sample points and tolerance must be agreed with the supplier. Streaks, contamination, register problems and incorrect colour sequence still require separate visual checks.
- Priority list for critical brand colours
- Combined use of visual reference and measurement
- Defined sample quantity and measurement positions
- Acceptance, rework or remake decision process
Build colour memory into repeat orders
After the first run is approved, link the material, ink formula, print process, finish, press conditions and measurement results to the order record. Store an approved production sample away from light and moisture so it remains a useful comparison for future reprints.
A packaging partner such as Lupipak, working across product selection and custom print, can plan how one brand colour should adapt to boxes, cups, wrapping paper and bags before production. The goal is not to force every material to look physically identical, but to make the family feel controlled, recognisable and consistent to the customer.
- Order-linked record of ink and material
- Approved physical sample protected from light
- New proof after a substrate or supplier change
- Reference and revision check for every repeat order