Node and Parameter Guide

This guide uses the friendly ComfyUI display names. The internal node IDs stay unchanged for workflow compatibility:

Recommended pipeline:

panel crop
  -> Blue Sketch Cleaner
  -> Line Gap Closer
  -> Color Region Finder
  -> colorization / correction

For full pages, run panel detection and cropping first. Full MC/MS pages are too complex for gap closing and region mapping as a default.

Blue Sketch Cleaner

Use this first. It detects blue rough pencil strokes and turns them into black line art on a white background.

Outputs:

Parameters:

Parameter	Default	How to use it
`hue_low`	90	Lower bound of blue hue in OpenCV HSV, range `0-179`. Lower it if cyan strokes are missed.
`hue_high`	145	Upper bound of blue hue. Raise it if purple-blue strokes are missed.
`saturation_min`	28	Minimum color saturation. Raise it to ignore pale paper/background noise. Lower it for very faint blue pencil.
`value_min`	20	Minimum brightness. Lower it if dark blue strokes disappear. Raise it if shadows/noise are selected.
`include_dark_lines`	false	Also include black/dark line art. Useful for mixed blue+black panels, but can catch text, borders, and shadows.
`despeckle_px`	8	Removes tiny connected specks below this pixel area. Raise it to remove dust; lower it if small intentional marks vanish.
`close_px`	1	Small morphological closing radius. Raise it to connect tiny cracks; too high will thicken or merge lines.

Starting recipes:

Blue rough only: defaults.
Very faint blue: saturation_min 15-25, value_min 10-20.
Too much background detected: saturation_min 45-70, despeckle_px 16-64.
Mixed blue and black line art: include_dark_lines true, then check the overlay carefully.

Use this after Blue Sketch Cleaner. It skeletonizes line art, finds endpoints, and draws short closure strokes between compatible endpoints.

Outputs:

Parameters:

Parameter	Default	How to use it
`threshold`	180	Pixels darker than this are treated as line. Lower it for strict black-only lines; raise it if gray lines are missed.
`closing_distance`	18	Maximum pixel distance between endpoints. Raise for bigger gaps; lower if unrelated lines get connected.
`spot_angle`	75	Direction tolerance in degrees. Lower values are stricter; higher values close more ambiguous gaps.
`line_width`	1	Width of newly drawn closure strokes. Use `1-2` for line art; higher values can muddy sketches.
`max_endpoints`	600	Safety cap. If exceeded, the node skips instead of making chaotic closures. Full pages often exceed this.

Starting recipes:

Panel crop: defaults.
Tiny broken strokes only: closing_distance 8-12, spot_angle 45-60.
Larger sketch gaps: closing_distance 20-32, spot_angle 75-100.
Full pages: avoid, or raise max_endpoints only for experiments after checking overlays.

Use this after gap closing. It finds connected white regions separated by black line art and makes a colored preview of fillable areas.

Outputs:

Parameters:

Parameter	Default	How to use it
`threshold`	180	Pixels darker than this are treated as line boundaries. Match this with Line Gap Closer.
`min_area`	32	Ignore fill regions smaller than this pixel area. Raise it to reduce noise; lower it to keep small details.
`max_regions`	128	Maximum regions returned per image. Raise for dense panels; if every image hits the cap, the input is too broad.
`ignore_border_regions`	true	Ignore open regions touching image borders. Keep true for panel crops; false can be useful for page/layout debugging.

Starting recipes:

If Blue Sketch Cleaner overlay looks right, the hue/saturation settings are good.
If Line Gap Closer returns endpoint_count_exceeded, crop smaller before using it.
If Color Region Finder always returns exactly max_regions, the image is too complex or too open.