Print gradients as separations

Last updated on Jun 2, 2026

Learn how to use appropriate color combinations and screen angles in Adobe InDesign to ensure gradients separate correctly onto process and spot color plates.

In most contemporary production environments, screen angles and frequencies are controlled in the RIP rather than in InDesign. Manual adjustment in InDesign is typically required only for legacy host-based separation workflows.

When preparing gradients for professional print workflows, understanding how colors separate onto printing plates helps prevent unexpected plate generation, unwanted overprints, or moiré patterns.

This guidance applies when you preview or output color separations from InDesign documents containing gradient fills.

These principles apply whether separations are generated in the RIP (modern PDF workflows) or via legacy host-based separations.

Gradient separation behavior depends on the color types used in the gradient stops. Gradients created using only process colors separate onto the CMYK plates. Gradients that combine process and spot colors separate onto both CMYK and spot plates.

Configure gradient separations by color type

For gradients containing only process colors, confirm separation behavior using Window > Output > Separations Preview.

For gradients blending two tints of the same spot color, confirm the gradient separates onto a single spot color plate using the Separations Preview panel.

To create a gradient that fades from a spot color to white on a single plate, create the gradient between your spot color and the Paper swatch in the Swatches panel (Window > Color > Swatches).

A gradient created between a spot color and the Paper swatch produces a single-plate separation that fades to the unprinted paper color, avoiding the creation of unnecessary plates.

For gradients mixing spot and process colors, expect separation onto both the process plates and the spot color plate(s). Preview all affected plates in the Separations Preview panel before printing.

Consider screen angle configuration only when generating host-based separations.

Select Window > Output > Separations Preview to identify all spot colors in your gradient.

If generating host-based separations, choose File > Print and select Output.

From the Color menu, choose Separations (host-based) or In-RIP Separations as required by your workflow.

Select the Ink Manager button to open the ink settings.

Select the each spot color from the ink list.

If manual screen angles are required, consult your prepress provider before modifying angle or frequency settings.

If multiple spot colors are screened, they should use distinct angles to reduce interference patterns.

Select OK to close the Ink Manager, then complete your print settings.

Alert

If multiple screened spot colors share identical angles and frequencies in host-based separations, interference patterns or moiré may occur.

Standard halftone angle sets (for example: C 105°, M 75°, Y 90°, K 45°) are commonly used in offset printing, but exact values vary by press and RIP configuration.