CMYK and four-color process: the guide to preparing a board game that comes out impeccable

A marketing director from an auditing firm sent us an onboarding game proof at the end of February. The file was in RGB, exported directly from Canva, the black in N100 on large areas, no bleed, no ICC profile. First prepress pass: automatic CMYK conversion with drift on corporate blues, black which would come out brownish, white net with inevitable cut on black backgrounds. Three days of back and forth to rebuild the files, and a little teaching. Six weeks later, on the same firm's next project, the files arrived in clean PDF/X-1a, CMYK, 3 millimeter bleed, embedded FOGRA39 profile. Incident-free production. This guide is designed to save those three days of back and forth for all in-house graphic designers who prepare their own files.

Four-color printing suffers from being perceived as a printer's subject, whereas it is primarily the responsibility of the graphic designer who prepares the file. Understanding what happens between the screen and the press is not a technical luxury: it is what allows us to anticipate the results and avoid disappointments at the time of printing. See our CMYK glossary page and our four-color glossary page for short definitions.

CMYK, Pantone, RGB: understand the difference

Three main families of color systems coexist. Distinguishing them well avoids half of the errors.

RGB (Red, Green, Blue). Additive system used by all screens (computer, televideo calln, smartphone) and all cameras. Three light sources which overlap and create all the colors by adding their intensity. Three channels from 0 to 255 (or 0 to 100% in percentage), value 0 0 0 = absolute black (no light), value 255 255 255 = absolute white (full light). RGB is the language of the screen, not the language of paper. More context on our RGB glossary page.

CMYK (Cyan, Magenta, Yellow, Black Key). Subtractive system used in printing. Four inks placed on paper which absorb part of the light (the other wavelengths are returned to the eye). Four channels from 0 to 100%, value 0 0 0 0 = bare paper (white depending on the paper), value 100 100 100 100 = theoretical maximum black (in practice 240-300% total ink). It is the language of printed paper.

Pantone (PMS, Pantone Matching System). Pantone glossary page Pantone glossary page.

A Pantone color can be converted in approximate CMYK equivalent, but it then loses its stability (each printer will reproduce CMYK with its own hazards). If you want to guarantee color, Pantone ink is the best choice. This typically applies to very saturated corporate colors (neon orange, bright apple green, certain electric blues) which fall outside the CMYK gamut.

Why print in CMYK and not RGB

The question comes up regularly: “my file is in RGB, what changes if I send it as is?” » Lots of things.

First, the printer does not print in RGB. Offset presses deposit CMYK inks, period. Any RGB file sent to a press undergoes a CMYK conversion - either done by the graphic designer (controlled conversion) or done automatically by the press's RIP (Raster Image Processor) at the time of printing (uncontrolled conversion). Uncontrolled conversion gives unpredictable results: the colors drift in a direction over which the graphic designer has no control.

Then, RGB and CMYK do not have the same gamut - the technical term for the color space reproducible by a system. The RGB gamut covers highly saturated blues and greens that CMYK cannot achieve. A color displayed vibrantly on screen can fall to a much duller tone in CMYK. This difference is inevitable: it's physics, not configuration.

Finally, channel separation changes everything. In RGB, a black can be 0 0 0 or 30 30 30, and does not print the same. In CMYK, a black can be 100 K alone or rich black, and does not at all give the same paper rendering. This nuance is inaccessible when working in RGB.

The business rule: work in CMYK from the design stage. Configure your software (Photoshop, Illustrator, InDesign, Affinity) in CMYK with ICC profile from the start of the file. Converting at the end of the chain gives surprises.

FOGRA39 ICC profile: the European sheetfed offset standard

An ICC (International Color Consortium) profile is a file that describes the color behavior of a system (screen, print, paper) and allows conversion between color spaces with minimal drift.

FOGRA39 (ISO 12647-2:2004). Recent development with slightly whiter coated paper (reinforced optical brighteners) and stricter calibration. Adopted by the most recent presses. For the majority of projects, FOGRA39 remains the common usage.

FOGRA51 (ISO 12647-2:2013). Recent development with slightly whiter coated paper (reinforced optical brighteners) and stricter calibration. Adopted by the most recent presses. For the majority of projects, FOGRA39 remains common use.

FOGRA47/FOGRA52. Profiles dedicated to uncoated offset papers with less dense black rendering and superior ink absorption.

Practical use: configure your software to use FOGRA39 as the default CMYK space (Photoshop: Editing → Colors → CMYK workspace → Coated FOGRA39 ISO 12647-2:2004). Working in this space, export the PDF by integrating the profile. When the file is received by the printer, the RIP uses the profile to faithfully reproduce the colors on the calibrated press. Without a profile, the printer must guess the colorimetric intentions of the graphic designer. With profile, colors come out as expected.

The black trap: composite vs 100% K

Black is the color that requires the most finesse in CMYK. Three uses stand out.

Black 100% K (C0 M0 J0 N100). “Pure Key” black: only black ink, without any of the three basic colors. Gives a slightly matte, slightly transparent black (shows the whiteness of the watermarked paper). Ideal use: texts and fine lines. For what ? Because there is only one ink deposited: no risk of misalignment between channels. An 8-point text in composite black 60 50 50 100 requires perfect registration so as not to show a colored halo on the edges of the characters. An 8-point text in N100 alone remains sharp even in the event of a slight machine shift.

Rich black (composite, C60 M50 J50 N100). “Rich” black: superposition of the four inks, which gives a much deeper, denser black, without any reflection of the whiteness of the paper. Ideal use: large black areas (box covers, black backgrounds on cards, graphic enhancement). For what ? Because large areas require “ink coverage” – the ink layer must hide the paper completely. A 100% K black alone on a 10 cm² solid color appears brownish in contrast with the surrounding colored areas. Rich black gives a deep black that “holds” visually.

Total ink (total coverage). Technical limit: the sum of the four channels must not exceed 300% (sometimes 280% depending on the press). A rich black 90 90 90 100 = 370% is rejected by the RIP: the accumulated ink does not dry correctly. Business rule: rich black 60 50 50 100 (260%) or C40 M30 J30 N100 (200%) to stay safe.

This nuance is invisible on screen but obvious in print. Re-exporting a file with a poorly managed black background results in a print that goes through visual validation... then comes out brownish on the press. This is one of the biggest expectations-reality gaps at the start of a career as a graphic designer.

Pantone corporate colors: when to switch to 5th color

The very saturated corporate colors (neon emergency orange, acid apple green, electric blue, neon pink) fall outside the gamut reproducible in four-color process. Without Pantone, these colors come out desaturated by about 30 to 40% compared to the screen. Four typical colors to note: Pantone Orange 021 C, Pantone 802 C (bright green), Pantone 803 C (neon pink), Pantone 286 C (IBM blue, reproducible in CMYK but with a slight drift).

The very saturated corporate colors (neon emergency orange, acid apple green, electric blue, neon pink) fall outside the gamut reproducible in four-color process. Without Pantone, these colors come out desaturated by about 30 to 40% compared to the screen. Four typical colors to note: Pantone Orange 021 C, Pantone 802 C (bright green), Pantone 803 C (neon pink), Pantone 286 C (IBM blue, reproducible in CMYK but with a slight drift). The very saturated corporate colors (neon emergency orange, acid apple green, electric blue, neon pink) fall outside the gamut reproducible in four-color process. Without Pantone, these colors come out desaturated by about 30 to 40% compared to the screen. Four typical colors to note: Pantone Orange 021 C, Pantone 802 C (bright green), Pantone 803 C (neon pink), Pantone 286 C (IBM blue, reproducible in CMYK but with a slight drift).

2. Does color recur on multiple supports? If the color identifies a brand that appears on business cards, packaging, clothing, web media, signage, events: Pantone highly recommended. Without dedicated ink, each medium reproduces the same color with its own vagaries, and the whole lacks consistency.

4. Is the color dominant? Pantone ink adds machine setup and marginal cost. On small series (under 500 units), the additional cost of tooling weighs proportionately more. On medium to large series, Pantone quickly pays for itself due to the color stability obtained.

4. Is the color dominant? A main solid color (background color, recurring banner, large format logo) justifies the Pantone. A detail in a complex illustration (five centimeter silhouette of a character) can remain in CMYK simulation without any perceived incident.

hot stamping complete guide The most common gap between expectations and results comes from an uncalibrated screen. Four points. The most common gap between expectations and results comes from an uncalibrated screen. Four points.

Digital BAT verification vs physical BAT

The most common gap between expectations and results comes from an uncalibrated screen. Four points.

The standard desktop screen drifts. Without hardware calibration (colorimetric probe), an ex-factory screen drifts towards blue, saturates the colors, and displays too much brightness for graphic validation. The graphic designer who validates “it looks good” on his uncalibrated screen is in reality validating a constant drift in relation to the press.

Hardware calibration is the benchmark. A colorimetric probe (X-Rite i1Display, Datacolor SpyderX, Calibrite Display) allows you to calibrate your screen to a reproducible standard (D65 6500K, 120 cd/m² brightness, gamma 2.2). For studios that regularly produce print files, the investment pays off very quickly.

The light environment matters. The screen does not replace the physical BAT.

The screen does not replace the physical BAT. Even a perfectly calibrated screen only shows light. The paper reflects. A physical proof printed on the target press remains the only way to definitively validate the colors. Details in the next section. See also our glossary page ready to print.

Digital BAT verification vs physical BAT

The BAT (Good to Print) is the last stage of validation before launching production. Two families.

Digital proof (PDF, screen). The final format print file is sent for proofreading. The client checks texts, layout, position of elements, bleeds, cutting template. It's useful but limited to geometric and textual aspects. The colors displayed on the screen do not prejudge the final paper rendering.

Physical proof (paper test). A paper proof reproducing the print file on the target paper (or a close equivalent) with a calibrated proofing press. This is the only reliable way to validate colors before production. The physical proof is generally charged but its cost is negligible compared to the risk of an entire bad print run.

The business rule: Physical proof required for any project with strong colorimetric constraints. Box covers with corporate color, detailed illustrations, high definition photos, multi-reference projects where color consistency is critical. For a simple project (a rulebook in two colors), the digital proof is sufficient. See our process know-how and our board game specifications.

Files to provide: PDF/X-1a, bleeds, 4 colors

The practical summary of the files to be delivered to your printer. Six points to check before sending.

1. PDF/X-1a format. ISO 15930-1 exchange standard designed for pre-press. Embedded fonts, embedded images in CMYK, no residual RGB elements, declared ICC profile. When exporting from Illustrator/InDesign: choose the PDF/X-1a:2001 preset (or PDF/X-4 for more recent versions accepting transparencies). This is the reference format accepted by all RIP printers.

2. All colors in CMYK. No residual image in RGB, no layer in Lab, no shades in sRGB. Check in the final PDF with a pre-flight tool (Adobe Acrobat Pro, Enfocus PitStop, Callas pdfToolbox). The slightest RGB element will be reconverted automatically by the RIP with drift.

3. Lost funds of 3 to 5 mm. Extending the printed background beyond the final cut line. 3 mm for media cut with a straight cut, 5 mm for media with a complex shape cut (boxes, cases, irregular shapes). See our glossary page template.

4. Cutting and folding lines. Include cut marks (corners or edge of the document) and fold marks (dotted lines on hinge areas of boxes/cases). These marks allow the cutter and the groover to align precisely. See our paper cutter glossary page.

5. Image resolution 300 dpi at final size. All images embedded at least in 300 dpi at their final reproduction size. An enlarged image after import into the model loses resolution. Check in the InDesign Links palette: “Actual DPI” must remain above 250.

The PDF must declare its output profile (Coated FOGRA39, for example). When exporting, check “Include ICC profiles”. This allows the RIP to faithfully reproduce colors on the calibrated press. The PDF must declare its output profile (Coated FOGRA39, for example). When exporting, check “Include ICC profiles”. This allows the RIP to faithfully reproduce colors on the calibrated press.

A file that meets these six points passes prepress control on first reading. A file that misses several triggers time-consuming round trips. Our team ofboard game printer can support this framing upstream of the quote, and our process know-how detail the complete workflow. For individuals as for B2B, these rules are identical - the rigor of the file does not depend on the ordering party, see our personalized birthday game guide.