Add SpriteSheetExtractor node

[ugotworms]

Add SpriteSheetExtractor custom node

Adds two nodes for extracting sprite sheets from WAN (or any batch) video output:

• SpriteSheetExtractor — Samples evenly-spaced frames, removes background via per-frame YCbCr chroma keying with flood-fill, applies palette lock for colour drift correction, and saves a horizontal RGBA sprite sheet PNG. Includes an interactive "Tweak Tolerance" panel for live adjustment without re-running generation.
• SpriteSheetPreview — Displays the sprite sheet as a looping pixel-art animation with checkerboard background for transparent areas.

Details:

• install_type: git-clone
• No extra pip dependencies (uses PyTorch, numpy, Pillow — all ComfyUI built-ins)
• NODE_CLASS_MAPPINGS: SpriteSheetExtractor, SpriteSheetPreview
• Category: image/animation

Repo: https://github.com/ugotworms/comfyui_sprite_sheet_extractor

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 143c1f74-a912-4856-be73-7ce6f3ea8534

📥 Commits

Reviewing files that changed from the base of the PR and between 579c4f9 and 9155752.

📒 Files selected for processing (1)

• custom-node-list.json

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📝 Walkthrough

Walkthrough

A new entry for "Sprite Sheet Extractor Nodes for ComfyUI" is appended to custom-node-list.json. The entry defines the node's id (sprite-sheet-extractor), author, GitHub reference, git-clone install method, description, Image Processing category, relevant tags, and version 1.0.0.

Changes

Sprite Sheet Extractor Node Registration

Layer / File(s)	Summary
New sprite-sheet-extractor node list entry custom-node-list.json	Inserts a 14-line JSON object defining the sprite-sheet-extractor node's full metadata: author, title, id, reference, pip/files fields, git-clone install type, description covering sprite extraction and background removal, Image Processing category, animation/video/WAN/chroma-key tags, and version 1.0.0.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

✨ Simplify code

• Create PR with simplified code

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