Quick tips for saving as PDF/X-4
By supplying files in PDF/X-4, you’re giving us the best possible foundation to produce accurate,
high-fidelity GMG EPSON proofs — exactly how your design will look in final print.
Please follow our PDF/X-4 file preparation guide below prior to upload for the most accurate EPSON proofing.
What is colour EPSON proofing and why does it matter?
Colour proofing is the process of simulating print output before production to ensure colour accuracy and consistency. At Codaproof, we use GMG ColorProof, the world’s leading EPSON proofing solution, trusted by the most demanding print professionals. Our clients achieve true-to-press colour confidence, saving time, cost, and brand reputation.
Why choose Codaproof for colour EPSON proofing?
Unlike generalist providers, Codaproof specializes in high-precision colour proofing using GMG software and calibrated EPSON printers. Our workflow is FOGRA/ISO certified, with built-in quality checks, and ΔE<2 tolerances. You’ll get proofs that are production-ready, consistent across print runs, and trusted by premium brands and agencies.
What makes GMG technology superior for proofing?
GMG ColorProof is recognized globally for:
Spectral colorimetric precision
Perfect calibration with EPSON SureColor & HP printers
Reproducibility across devices and locations
We combine this with decades of print experience to ensure your colours don’t just look good—they print perfectly.
Do you provide verified hard EPSON proofs?
Yes. Every EPSON proof is verified using GMG ProofControl, which measures colour patches with a spectrophotometer and confirms ISO/Fogra compliance. You’ll receive a signed verification strip with every EPSON proof—an assurance your print run will match your sign-off.
Can you match PANTONE and spot colours accurately?
Absolutely. Our GMG system uses spectral color libraries and device-link profiles to simulate Pantone, spot colours, and even custom brand colours with exceptional fidelity—even on uncoated stock.
How do I prepare my artwork for accurate proofing?
Convert artwork to CMYK or spot colours; avoid RGB.
Embed ICC profiles (ideally ISO Coated v2 or GRACoL).
Export to PDF/X-1a or PDF/X-4, including bleed and trim marks.
Flatten transparencies and convert fonts to outlines.
Need help? We offer free file checks before proofing.
How Accurate Are Codaproof EPSON Proofs?
At Codaproof, colour accuracy isn’t a feature — it’s our foundation.
We use cutting-edge GMG ColorProof software in combination with EPSON SpectroProofer hardware to deliver exceptional spot colour fidelity and consistency.
99.8% accurate reproduction of the PANTONE® range, including spot colours, tints, gradients, and complex overprints
Support for white ink printing on clear films and metallic substrates — perfect for high-end packaging visuals
Exceptional results across both coated and uncoated stocks
Whether you’re testing a carton mockup or previewing a luxury label, our proofs let you preview colour-critical designs with unmatched accuracy.
What industries benefit most from
GMG-proofed colours?
Retail packaging
FMCG / Retail
Cosmetics and fashion brands
Pharmaceutical labeling
High-end print agencies
These industries can’t afford colour inconsistency—and GMG EPSON proofing ensures they never see it.
Are Our EPSON Proofs Verified?
Yes — every Codaproof output is backed by precision verification.
We follow the FOGRA colour standard, using GMG calibration tools to ensure every white paper proof meets or exceeds Delta E tolerances.
EPSON proofs are verified to contract-level accuracy
We also support industry standards like GRACoL and SWOP, on request
A verification label is printed directly onto each EPSON proof with full measurement data
This means your EPSON proof isn’t just visually close — it’s measurably compliant to the same standards trusted by top print professionals worldwide.
What Sizes Can You Print?
We’re equipped for anything from compact mockups to full-scale packaging layouts.
We can print up to 36 inches wide (914 mm) by 100 feet long
All standard proofing sizes are supported: A6, A5, A4, A3, A2, A1+,
with bleed and crop marks as needed
Custom sizes and nested layouts are available to suit packaging nets or larger compositions
Need something special? Just ask — we’ll tailor the setup to your job.
How Much Do Proofs Cost?
We believe in premium quality without premium pricing.
Codaproof offers a cost-effective solution for accurate,
verified EPSON proofs — with flexible delivery options and trade pricing for repeat clients.
Get in touch for a detailed quote — we’re happy to advise based on size, volume, and turnaround time.
How Fast Is Delivery?
Fast. Really fast.
We offer same-day dispatch or overnight courier delivery as standard.
On tight deadlines?
No problem — we’ll find the fastest route to get your proof where it needs to be,
on time and in perfect condition.
What File Format Should I Use?
For the most reliable and colour-accurate results,
we recommend supplying your artwork as a PDF/X-4 file.
Why PDF/X-4?
Maintains live transparency and layers
Supports CMYK, spot colours (including PANTONE®), and RGB profiles
ideal for modern proofing workflows like GMG, ensuring the most accurate simulation of print output
Compatible with overprints, effects, and high-resolution images
If you’re unsure how to export your artwork to PDF/X-4, we’re happy to advise — just get in touch.
We can also accept PDF/X-1a, TIFF, or InDesign packages where necessary, but PDF/X-4 gives the best results for colour-managed EPSON proofs.