WhiteLayer Studio knowledge
What is a white underbase?
A white underbase sits beneath color artwork so a dark or transparent substrate does not visibly alter the colors above it. It is separate production information, not a white object inside ordinary CMYK or RGB artwork.
Your print provider decides whether white must be supplied as a spot color, layer, separate file or second PDF page. WhiteLayer Studio creates a registered white page for a manual two-page PDF workflow; it does not replace RIP-specific separations or machine settings.
Derive coverage from transparency
Opaque artwork normally needs a stronger base while partially transparent edges may need graduated coverage. A solid mask can close soft shadows, smoke or hair. Inspect the mask against both black and white backgrounds.
- Represent opaque areas clearly
- Handle partial transparency deliberately
- Keep empty areas free of white
Use choke to control the edge
Choke moves the underbase edge inward so minor registration variation does not reveal a halo. The correct amount depends on resolution, detail, substrate and process; there is no responsible universal value.
- Start with a small adjustment
- Inspect fine lines and small type separately
- Do not remove support from colored edges
Match registration and page geometry
Color and white pages need identical size, orientation, scale and artwork coordinates. Automatic “fit to page” settings can create a visible offset, so compare both pages independently before production.
Solid or grayscale mask?
Solid masks suit hard-edged artwork. A grayscale mask can describe variable coverage if the production workflow supports it. Confirm how the RIP interprets tonal values; a plausible PDF preview does not prove the resulting toner density.
Workflow
Step by step
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01
Confirm production requirements
Ask about file format, white representation, page order, mirroring and supported tonal values.
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02
Clean the transparency
Remove background remnants, matte halos and unintended partial transparency.
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03
Create the white mask
Use artwork opacity as a starting point and separate visible white from underbase-only areas.
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04
Tune the edge
Increase choke carefully and inspect small details at high magnification.
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05
Compare geometry
Verify page size, position, scale and orientation between color and white.
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06
Approve a test print
Test the actual substrate and record the approved value as a repeatable production profile.
FAQ
Frequently asked questions
How much choke should a white underbase use?
There is no universal safe value. Resolution, registration tolerance, substrate and artwork detail determine the adjustment. Start small and approve it with a test print.
Why not make the white mask larger?
If it extends beyond the color, it creates a visible white halo. Excessive white can also distort soft edges and transparency.
Must white always be 100 percent?
No. Some workflows support graduated white values while others expect solid coverage. Follow the RIP or provider specification.
Is WhiteLayer Studio a RIP?
No. It prepares color and white pages for a controlled PDF workflow. Machine profiles, toner density and print control remain in production.
WhiteLayer Studio knowledge
Sources and technical references
- OKI – White & Clear Print Guide Manufacturer guidance for SpotColor_White and white-print workflows.
- Ghost White Toner – Toner Transfer Guide Practical white-toner and transfer guidance; confirm settings for the actual system.