CMYK Commercial Print Mode

CMYK Commercial Print ModeCMYK Commercial Print Mode

Professional printing services work in the CMYK colour model (Cyan, Magenta, Yellow, Key/Black) rather than the RGB model used by screens. CMYK has a smaller colour gamut – it cannot reproduce certain vivid neon or electric colours that look brilliant on screen. A design that appears vibrant on your monitor can look noticeably duller when printed with physical ink.

Open Publisher’s CMYK Soft-Proof mode lets you preview exactly how your colours will shift before sending your file to a commercial printer, so there are no surprises when the physical copies arrive.

Enabling CMYK ModeEnabling CMYK Mode

  1. Go to File > Info.

  2. Find the Colour Mode toggle and switch from RGB to CMYK.

When CMYK mode is active, Open Publisher applies a custom SVG soft-proof filter across the entire canvas. Vivid, out-of-gamut colours – such as neon greens, electric blues, and hot pinks – are intelligently dulled to give you an accurate real-time preview of how the document will look when printed with physical ink.

Switch back to RGB at any time to return to the full screen-accurate colour display. Your selected colour model is saved into the .opub file and persists between sessions.

When to Use ItWhen to Use CMYK Mode

CMYK mode is most useful when:

  • Designing flyers, brochures, or any document that will be sent to a commercial print shop.

  • Working with bright or vivid brand colours that may not survive the RGB-to-CMYK conversion faithfully.

  • Checking whether a full-bleed background or image will retain its intended appearance in physical print.