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Autograph to Nuke EXR and OCIO handoff checklist

Published 2026-07-09 · Wiki · Nuke / EXR / OCIO / Workflow

A practical handoff checklist for moving an Autograph render into Nuke without losing alpha intent, EXR channels, data passes, frame-range meaning, or color-management context.

Why this page exists

Autograph can sit near motion graphics, effects design, and lighter compositing work, while Nuke is often the final node-based compositing environment for VFX shots. The handoff point is usually not a single export setting. It is a small contract: frame range, file naming, alpha state, channel names, OCIO setup, view transform, and which application is expected to own final comp decisions.

Minimum handoff package

• Image sequence: prefer an EXR sequence for comp handoff when downstream grading, relighting, keying, or pass work is expected. Use a review movie only as a viewing proxy.
• Frame contract: record start frame, end frame, handle count, slate or burn-in behavior, and whether frame numbers match edit, shot, or local work range.
• Resolution contract: record resolution, pixel aspect, overscan, crop, and whether the EXR data window differs from the display window.
• Alpha contract: state whether RGB is premultiplied, unpremultiplied, or intentionally opaque. Do not leave this to visual guesswork.
• Color contract: record the OCIO config, ACES or non-ACES working space, view transform used for approvals, and which passes are data rather than color.
• Channel contract: list expected channels and layers before the handoff, then verify them in Nuke after import.

Checks inside Autograph before export

• Turn off temporary viewer-only corrections before rendering a comp handoff, unless those corrections are part of the intended image.
• Test one short range through the exact output preset before committing a full sequence.
• Render a known alpha edge, a full-white frame, a full-black frame, and a frame with motion or blur if the shot depends on premultiplication or filtering behavior.
• If an OpenFX plug-in is part of the render path, test the plug-in on the same bit depth, channel set, and frame range that the shot will use.
• Keep a separate review export with the approved view transform so that the Nuke import can be compared against the expected viewing result.

Checks inside Nuke after import

• Inspect the file metadata, format, frame range, channel list, and alpha before adding creative nodes.
• Check whether the display window and data window match expectations, especially if overscan or cropped regions were rendered.
• Confirm that non-color passes such as depth, normals, vectors, IDs, or matte channels are not being treated as display-referred color.
• Compare a Nuke viewer snapshot against the approved Autograph review export under the same view transform. Do not compare a scene-linear EXR directly to a display-referred movie without accounting for the transform.
• Round-trip a short Nuke render back into Autograph or another viewer only if that is part of the production path. Otherwise, avoid inventing a test that the real job will not use.

Common failure signs

• Edges look dark, bright, or fringed after an over operation, usually pointing to mismatched premultiplication expectations.
• The beauty image matches, but utility channels are missing, renamed, clipped, or transformed.
• The review movie looks approved while the EXR appears too flat, too contrasty, or wrong in Nuke because the viewer transform is not matched.
• Frame numbers line up visually but handles are missing, duplicated, or offset relative to the editorial pull.
• Overscan exists in the file but is cropped by the format setup or ignored by a downstream script.

Decision rule

Use Autograph as the creative source only when the handoff file can be verified independently. If Nuke needs to own final comp, treat the Autograph export as an incoming element with a written contract, not as proof that the downstream comp state is correct.

Useful next pages

• Autograph EXR channel and data-pass checklist
• Autograph color transform troubleshooting checklist
• Scene-linear EXR, ACES, and OCIO handoff checklist

Sources checked

• Maxon Autograph product page — checked 2026-07-09. Used for Autograph context: motion graphics and VFX/compositing positioning, OpenFX, EXR, ACES, OCIO, and related host-surface claims.
• OpenEXR Technical Introduction — checked 2026-07-09. Used for high dynamic range, arbitrary channels, data window versus display window, premultiplied alpha convention, data types, and multi-part context.
• OpenColorIO colorspaces documentation — checked 2026-07-09. Used for scene-referred color, data/non-color handling, encodings, and transform-context terminology.
• Foundry Nuke documentation — checked 2026-07-09. Used as the Nuke-side documentation shelf for import, channel, color-management, and compositing verification context.