laidline-comfyui

ComfyUI custom node LaidlineSaveImage ("Save Image (Laidline: sign + watermark)", category image/laidline). It replaces ComfyUI's Save Image node: each image in the batch is watermarked with TrustMark, signed with a C2PA manifest, logged to the evidence sinks, and written to ComfyUI's output directory.

Modes

• Remote (sidecar): set LAIDLINE_URL to the Laidline server (and LAIDLINE_API_KEY if it requires one). Takes precedence when both are set.
• Embedded: set LAIDLINE_CONFIG to a laidline.yaml; marking runs in the ComfyUI process.

With neither set, the node fails with Laidline: set LAIDLINE_URL (sidecar) or LAIDLINE_CONFIG (embedded).

Inputs and outputs

• images (IMAGE): the batch to save.
• filename_prefix (STRING, default laidline): as in Save Image; may include a subfolder.
• format: png, jpeg or webp.
• request_id (STRING, optional): recorded in the evidence log.

The node passes images through unchanged. Its ui output lists the saved files under images and, under laidline, one entry per file with asset_id, manifest_id and warnings (for example watermark_skipped:too_small when the short side is under watermark.min_side_px, default 128). A marking failure is raised as a RuntimeError shown on the node.

There is no LaidlineMarkImage node: a marked tensor cannot carry a C2PA manifest and any downstream node re-encodes it, so only the saved file can be signed.

Installation

Copy or symlink laidline_comfyui into ComfyUI's custom_nodes/ and pip install laidline[image]. The pack uses relative imports only, so ComfyUI's custom-node loader can import it from custom_nodes/.

Proven against a real ComfyUI v0.37.0 on CPU (remote mode, PNG and JPEG: watermark, Trusted manifest and evidence entry with route: comfyui:LaidlineSaveImage). Setup and the full guide: https://laidline.com/docs/integrations/comfyui.