中文Wide-format digital presses can reproduce a far larger colour gamut than standard offset CMYK, yet many print providers unintentionally clip that capability by applying offset simulation profiles. A guide by colour expert Paul Sherfield explains when to unlock a press’s full gamut – ideal for fine art, point-of-sale graphics and Pantone brand matching – and when to restrict output to offset standards such as Fogra 39 or 51 for cross-process consistency.
The central decision is whether to preserve offset litho consistency or run the digital press at its widest practical gamut. That choice must be made before profiling and rendering are set, because the target profile determines whether the extra colour capacity is even available to the job.
Most wide-format digital presses offer a wider gamut than normal offset CMYK, but that capacity is frequently restricted by using offset litho ICC profiles as the output or simulation profile. The rationale is to match colour output to an offset standard such as ISO 12647-2 for brand and image consistency. The cost, however, is dramatic: one comparison shows a press maximum gamut of 848,826 colours on the chosen paper, reduced to 400,027 colours – under half the volume – when an offset coated simulation profile is applied.
Gamut volume comparisons make the trade-off concrete. Offset litho CMYK (Fogra 39/51) measures about 400,000 colours; Fogra 55 CMYKOGV about 545,000; toner digital CMYK about 470,000; continuous-feed narrow-web inkjet CMYK about 550,000; a wide-format 12-colour water-based inkjet press about 950,000; and wide-format CMYK solvent or UV presses around 450,000. Not every device has extra colours – some UV and solvent machines sit near 450,000, close to offset.
Optimising RGB workflows and ICC profiles is the practical path to expanded gamut. First, images with a large RGB ICC profile benefit from the wider gamut of some wide-format inkjet printers and improve accuracy on Pantone and brand colours; the DFE’s colour management should transform the RGB profile to the device profile. Second, thought should go into where RGB files are converted – within a capable DFE at processing time, or via image-editing and colour-server software. Third, when running multiple similar presses, compare device ICC profiles and use the smallest as a simulation profile to keep output consistent. Fourth, consider Fogra 55 CMYKOGV as a recognised wide-gamut standard, depending on DFE support for seven-colour simulation.
Certain conditions must be addressed for maximum-gamut workflows. The maximum gamut must be known for each substrate, with a custom ICC device profile produced; installed generic profiles are less accurate. Providers should ask whether the wider gamut offers meaningful benefit for the markets they serve, and whether colour-managed workflows support it. Client-supplied CMYK files already reduced to an offset profile may yield unacceptable results if forced to the press maximum, so ICC-profiled RGB images remain the best source for exploiting expanded gamut.
Offset simulation profiles are the right call when a project mixes processes and all items must match – images, brand and company logos likely printed by offset set the standard, potentially restricting wide-format gamut.
Applications that benefit most from maximum gamut include point-of-sale and retail graphics needing vivid colour; fine-art and photographic prints wanting richer tone; brand-critical work with logos and Pantones CMYK cannot hit; exhibition graphics with saturated RGB imagery; digital-only campaigns with no offset match requirement; and premium packaging, decor and speciality products where colour impact adds value. Wide-format printing delivers its greatest value when ICC-profiled RGB workflows exploit the full gamut, while offset simulation profiles serve cross-process consistency.
Article based on reporting from FESPA.
The practical takeaway for print providers is to make the gamut decision deliberately rather than by default. Too many wide-format shops inherit an offset simulation profile from habit and never realise they are sacrificing half their press’s colour volume. The remedy is straightforward: profile the device on each substrate, understand the maximum gamut available, and choose simulation only when a project genuinely requires cross-process matching.
A useful rule of thumb is to separate digital-only work from mixed-process work. Campaigns, fine art, retail graphics and brand-critical colour that will never be printed offset should exploit the full device gamut via ICC-profiled RGB images. Projects that must sit alongside offset-printed components should be constrained to a recognised offset standard such as Fogra 39/51, or Fogra 55 where seven-colour simulation is supported. Making that call per job – documented in the workflow – is the difference between a press that merely prints colour and one that prints the right colour for the right purpose.
Providers who master this distinction gain a quiet competitive edge. They can promise brand managers accurate Pantone reproduction on premium jobs and reliable cross-process matching on mixed campaigns – two different promises, kept consistently. The cost of ignoring it is subtle but real: a shop that always simulates offset may quietly disappoint clients who expected the vivid, saturated output their wide-format press was built to deliver. Treating gamut as a deliberate, per-job decision turns a hidden technical default into a visible service capability that justifies premium pricing.
