Ask the printer for its file requirements and output condition before converting the artwork. Keep an RGB master, use a suitable external color-managed application to simulate the printer’s profile, and approve a physical sample when color matters. A generic “CMYK” setting is not a specification for every paper, ink set and press.
Get the destination in writing
Record the printer, product, paper or substrate, required file format and who performs color conversion. Some suppliers request RGB uploads and convert them internally; others require a particular CMYK PDF. Follow the selected job’s instructions rather than converting merely because the final object is printed.
Ask which profile and proof conditions the supplier recommends. If no usable profile is available, you can still review a sample, but label any screen simulation as approximate. Do not download a random press profile and assume it represents a different supplier’s matte paper.
Simulate first, convert a copy second
Adobe’s soft-proofing guidance describes simulating an output profile while comparing the original. In an external application, select the actual destination profile where available and inspect the colors that carry the design: skin, brand accents, dark text and a smooth background gradient. Decide which differences are acceptable before changing the artwork.
Do not use profile assignment as a shortcut for conversion. Adobe distinguishes Assign Profile from Convert to Profile: assigning changes the interpretation of existing numbers, while converting changes the numbers for another color space. Save a delivery copy according to the printer’s instructions and keep the RGB master intact for other destinations.
Soft proofing is a prediction, not an inspection of ink on paper. Monitor condition, viewing light and profile accuracy affect its usefulness. If the paper color is central to the design, ask about the supplier’s paper simulation or proof process instead of judging a bright screen against an unlit sheet.
Fictional example: a teal exhibition poster
Devon designs a teal photographic poster in a fictional project. The printer asks for a specified CMYK PDF on uncoated stock. Devon records the request, keeps poster-RGB-master, then makes a delivery copy in an external layout application. The soft proof suggests the saturated teal will become quieter; Devon adjusts the surrounding contrast without changing the photographer’s skin tones.
The approval note has separate entries: “screen simulation reviewed” and “physical paper sample approved.” Only the second describes an actual inspected sample. Devon checks the sample under agreed viewing light, compares the title and shadow detail, then approves that version for the named stock. Switching to a glossy stock later triggers a fresh review rather than reusing the old approval automatically.
Make the final handoff specific
Use Imagild Image Prompt for an appropriate artwork treatment if needed, then perform the color-managed print preparation externally. Inspect the real exported file, including its dimensions and destination profile requirements. A generated image or browser preview does not prove that a press profile was applied.
Send the delivery file with its intended product and version. Ask the supplier to flag changes to stock or conversion settings before production. A small documented sample decision is more useful than a vague promise that the screen and paper will match perfectly.
Should I keep only the CMYK file?
Keep the RGB master as well. It supports later screen use and a different printer without repeatedly converting an already reduced-gamut copy.
Can every bright RGB color survive CMYK conversion?
No universal match is possible. Decide which visual relationships must remain, inspect the destination simulation and use a physical proof for the actual job.