TL;DR: Submitting an incomplete colour brief is the single most common reason a sample round turns into three — get your file specs, substrate, and proof intent aligned before you send the first email.
TL;DR: A production-ready PDF/X-4 file with 3mm bleed, embedded ICC profile, and ΔE tolerance of ≤2.0 cuts average sample iterations from 2.8 rounds down to 1.4 rounds on our folding carton lines.
What Your Colour Brief Actually Needs to Contain #
Before we can generate a meaningful quote or cut a first proof, we need more than a PDF of your label and a box dimension. Colour management for packaging is process-specific — the same Pantone 485 C will reproduce differently on a 350gsm SBS carton run on our 8-colour Heidelberg versus a 40μm BOPP film run on the flexo press. Which press, which substrate, and which proof standard you’re targeting each pull the quote in a different direction.
The file package we need at brief stage:
- Artwork: PDF/X-4 preferred, PDF/X-1a acceptable. Resolution for raster elements: 300 dpi minimum at final print size, 1200 dpi for fine linework or barcode elements. Embedded ICC output profile (ISOcoated_v2_eci.icc for coated litho; FOGRA55 for high-density litho; a substrate-specific profile if you have one).
- Bleed and safe zone: 3mm bleed on all edges is our standard for sheet-fed offset cartons. For flexible packaging with registration variance, we extend bleed expectation to 4–5mm on the seam edge.
- Colour callouts: Identify every Pantone reference by number (coated or uncoated — specify). If you have brand-defined ΔE tolerances written into a brand standards document, attach it. If you don’t have one, tell us the category — food, cosmetics, luxury goods — and we’ll apply the appropriate tolerance tier from our CM-BCS-02 colour brief checklist.
The structural data we need alongside the artwork:
Flat dimensions or finished dimensions (not both — pick one and we’ll derive the other), material preference or constraints, print process preference if you have one, and your target quantity tiers. Quotes structured around 1,000 / 5,000 / 10,000 units give us three meaningful cost breakpoints without over-engineering the estimate.
| Information Type | Minimum Required | Ideal Brief Includes |
|---|---|---|
| Artwork file | PDF/X-1a, 300 dpi, 3mm bleed | PDF/X-4, embedded ICC profile, separated spot colours |
| Colour specification | Pantone reference numbers | Pantone refs + ΔE tolerance + brand standard document |
| Structural data | Finished dimensions + substrate preference | Dieline file (AI or DXF) + material grade + closure type |
| Quantity | Single target quantity | Three tiers (e.g. 1k / 5k / 10k) for breakpoint pricing |
| Proof intent | “Need a sample” | Defined: white sample / digital proof / hard contract proof / production sample |
Leaving the proof intent column blank is where we see the most requotes. “Need a sample” doesn’t tell us whether you want a grey-chipboard structural mock-up with no print (fastest, lowest cost) or a G7-calibrated contract proof on production substrate with Pantone spot match (4–6 working days longer, measurable cost delta). Those are not the same deliverable.
Where Briefs Break Down and What It Costs You #
The most consistent delay pattern we see is mismatched proof intent between what the brand believes they requested and what the supplier understood. Here’s what that looks like in practice.
A buyer sends a brief asking for a “printed sample” of a cosmetics folding carton. The artwork has a hot foil element on the logo and a soft-touch matte lamination spec. We confirm dimensions and material, produce a digital inkjet proof on coated paper (which is our default interpretation of “printed sample” unless told otherwise), and ship it within 5 working days. The buyer rejects it because the foil is absent and the surface finish isn’t representative. That round is wasted because no one defined the proof type. This iteration pattern is logged under Review Code S2 in our internal sample tracking system — it accounts for roughly 40% of all first-round rejections across our proofing jobs in 2024.
The second failure pattern is late Pantone revision. A buyer submits a PDF with Pantone 2746 C called out, we pull ink, calibrate press curves against ISO 12647-2 tolerances, and produce the proof. The buyer then mentions they “updated the brand guidelines three months ago” and the correct reference is now Pantone 2748 C. Those two shades sit far enough apart that our existing colour build requires a rematch — a ΔE of approximately 4.7 between them under D50/2° observer conditions, which is outside any reasonable ±1.5 ΔE pass/fail threshold for brand colour. A new proof round follows.
The third pattern is structural ambiguity paired with print spec. We’ve had briefs where the buyer provided outer carton dimensions but the product inside had a 2mm tolerance stack from a thermoform insert and the insert supplier hadn’t confirmed final dimensions. We build the structural dieline, develop print films, produce a proof — and the box is 3mm too narrow after the insert is confirmed. Structural data and print development need to be locked simultaneously, not sequentially.
How Should You Compare Quotes From Different Suppliers? #
Normalise for proof type before you compare line items. A quote that includes a G7-certified press proof on production substrate is structurally more expensive than one that includes a digital inkjet proof — and it should be. If you’re comparing them on total cost without separating proof deliverable, material grade, and unit price, you’re comparing incompatible numbers.
Three things to align before you compare: substrate grade (ask each supplier to specify GSM and board grade, not just “350gsm coated”), colour proof standard (ask whether their proofing workflow is certified to ISO 12647-7 or G7 Master), and whether the sample cost is credited against production — our policy is to credit 100% of hard sample costs against the first production order above 3,000 units.
For tolerances, ask each supplier for their stated register tolerance and ΔE pass/fail threshold in writing. Our standard on sheet-fed offset is ±0.2mm register and ΔE ≤2.0 for process colours against ISO 12647-2, ΔE ≤3.0 for brand Pantone matches. If a supplier can’t give you those numbers, their quality system isn’t structured to defend them.
Specification Notes for Brand Partners #
When you brief us on a colour management and proofing project, the most useful thing you can send upfront is: the artwork file (PDF/X-4 with embedded profile), a completed colour callout sheet listing every Pantone reference, your target substrate, and a clear statement of what the sample needs to demonstrate — structural fit, colour match, or both.
The gap we see most often in incoming briefs is undefined lamination or surface finish intent. If the final pack has soft-touch matte, gloss UV, or aqueous coating, that finish must be present on the proof for the colour assessment to be valid — these coatings shift perceived ΔE by 1.5–3.0 units depending on the coating density and the colour underneath. Sending an uncoated proof for a coated production job and approving it will result in a colour shift at production that neither party can easily resolve.
Our standard timeline for a digital colour proof on client-supplied artwork is 3–5 working days from receipt of a complete brief. A physical contract proof on production substrate runs 7–10 working days. A full production sample with all finishing applied is 15–20 working days. Each of those timelines extends by approximately 2 working days for every round of correction — which is why the brief completeness matters more than the sample type.
Frequently Asked Questions #
What file format should I send if I don’t have a PDF/X-4?
PDF/X-1a is acceptable. If you only have a native Adobe Illustrator file (.ai) with linked assets and fonts, we can work from that, but we’ll convert it to a press-ready PDF internally and send you a soft proof for sign-off before we cut any physical samples — which adds roughly 1 working day to the front of the timeline.
Do I need to provide a dieline file, or can you generate it from my dimensions?
It depends on the complexity of the closure. For standard straight-tuck or reverse-tuck folding cartons, we can generate a dieline from your finished dimensions alone. For custom structural features — magnetic closures, complex auto-bottom constructions, or tray-and-lid formats — you should either supply a dieline or allow a structural development round (typically 3–5 working days) before print development begins. Skipping structural confirmation on complex formats is the fastest way to end up with a printed proof that doesn’t close correctly.
How do you handle Pantone matching when the target substrate isn’t coated white?
We measure ΔE under D50/2° observer conditions against the reference Pantone patch on production substrate, not against the swatch book. For uncoated boards, natural kraft, or coloured substrates, we adjust the ink build and explicitly note the expected ΔE shift in the proof sign-off document. If your brand standard requires a ΔE ≤1.5 on a non-white substrate, we’ll flag that at brief stage — some substrates simply can’t hold that tolerance without a white ink flood coat, which affects cost and lead time.
Is the sample cost separate from the production quote?
For hard samples (contract proof or full production sample), the cost is quoted separately. For digital soft proofs, there is no standalone charge. Sample costs are credited 100% against the first production order of 3,000 units or more — for orders below that threshold, the credit is prorated at 50%.
What’s the minimum information needed to get a ballpark quote?
Finished carton dimensions, substrate type (folding carton, rigid box, flexible pouch), approximate print specification (number of colours, any spot finishes), and a quantity tier. We can turn around a budgetary estimate within 24 hours on that basis. A production-accurate quote with confirmed lead times requires a complete brief as described above — typically 48–72 hours from brief receipt.
Planning a packaging project? Contact our team to request a complimentary specification review and sample quote.
