ComfyUI Dynamic Sigmas

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Create, reshape, inspect, combine, and reuse custom sigma schedules in ComfyUI. Model-family profiles provide practical starting curves without requiring a MODEL connection, while every resulting schedule remains editable.

Search for cozdx1 in the node menu to find all four nodes.

_{Illustrious/SDXL in the dark editor and WAN in the light editor.}

What's new in v1.1.0

• Profiles for Illustrious/SDXL, Anima, WAN, LTXV, Z-Image, Qwen-Image, Flux2, Krea2, and Custom.
• Real-time previews for 11 schedulers, including beta57 and bong_tangent.
• Editable graph endpoints, per-step values, curve shaping, and adjustable monotone smoothing.
• Graph Sigmas output presets from 450×300 to 1200×800 with resolution-aware styling.
• A compact SIGMAS to SCHEDULER_FUNC bridge for compatible Detailers and sampler nodes.
• Korean localization, in-app documentation, and migration for workflows saved with v1.0.x.

Quick start

1. Add [cozdx1] Dynamic Sigma Scheduler.
2. Choose a model profile, scheduler, and step count.
3. Adjust the endpoints or shape, or edit the graph directly.
4. Connect sigmas to a compatible sampler, Graph Sigmas, Concat Sigmas, or Sigmas to Scheduler Func.

Profiles are starting points, not model auto-detection. Check the appropriate sigma range for the model, sampler, and workflow you are using.

Nodes

[cozdx1] Dynamic Sigma Scheduler

Builds a SIGMAS tensor and previews it immediately, before the queue runs. The output always contains steps + 1 values because both endpoints are included.

Model profiles

Profile	Sampling family	Default shift	Default start
illustrious / sdxl	SDXL discrete	—	15.0
anima	Discrete Flow	3.0	1.0
wan	Discrete Flow	8.0	1.0
ltxv	Flux	2.37	1.0
z-image	Discrete Flow	3.0	1.0
qwen-image	Flux	1.15	1.0
flux2	Flux	2.02	1.0
krea2	Flux	1.15	1.0
custom	Manual	—	Keeps the current values

Changing a profile selects its sampling family and default shift/endpoints. Select custom when you want to keep the current values and shape the schedule manually. Flow shift is disabled for Illustrious/SDXL and Custom.

Supported schedulers

simple, sgm_uniform, karras, exponential, ddim_uniform, beta, beta57, normal, linear_quadratic, kl_optimal, and bong_tangent.

Shape controls

• sigma_start / sigma_end: Set the first and final values. Intermediate endpoints can be useful when schedules will be concatenated.
• curve_factor: Positive values hold higher sigmas longer; negative values make them fall earlier.
• smooth_strength: Blends manually edited sections from linear (0) to monotone cubic (1) without adding a rise between monotone control points.
• show_steps: Shows all sigma values as editable six-decimal widgets. These widgets can also be converted to inputs.
• black_theme: Changes only the editor theme.
• Generate Curve: Discards manual edits and regenerates the curve from the current controls.
• Reset Profile: Restores the selected profile's default shift and endpoints as well as its curve.

_{Negative and positive curve_factor values move the curve in opposite directions.}

_{smooth_strength blends a manual curve from linear interpolation to monotone cubic interpolation.}

Manual editing

Click an empty graph position to add a control point, then drag it to reshape the curve. Shift-click a custom point to remove it. The first and last graph points stay synchronized with sigma_start and sigma_end.

Direct graph editing	Editable per-step values
Add and drag control points.	Enable show_steps to edit exact values. Click to view the full-size image.

The emitted schedule is a one-dimensional float32 tensor.

[cozdx1] Graph Sigmas

Renders each connected sigma schedule as a ComfyUI IMAGE. Increase input_count to add matching SIGMAS inputs and IMAGE outputs.

• black_theme: Selects a dark or light plot.
• preview_resolution: Selects Compact (450×300), Default (600×400), Large (900×600), or High (1200×800).
• Labels, strokes, markers, and spacing scale with the selected resolution. Existing workflows retain the 600×400 default.

[cozdx1] Concat Sigmas

Joins connected schedules in numeric input order. Increase input_count to add inputs.

The final value of each non-final schedule is removed so a shared boundary is not duplicated. For example, [1.0, 0.5] followed by [0.5, 0.0] becomes [1.0, 0.5, 0.0].

_{Concat Sigmas joins multiple sigma sequences into one schedule.}

Concat Sigmas does not alter values or force adjacent endpoints to match. Set the boundaries intentionally when a continuous schedule is required.

[cozdx1] Sigmas to Scheduler Func

Converts an existing SIGMAS schedule into a callable SCHEDULER_FUNC for compatible nodes.

Dynamic Sigma Scheduler → Sigmas to Scheduler Func → scheduler_func_opt

This includes Impact Pack's FaceDetailer, FaceDetailer (pipe), MaskDetailer (pipe), DetailerForEach variants, and other nodes that expose the same input type.

• When the receiving node requests the same step count, the original schedule is returned unchanged.
• When the step count differs, the curve is linearly resampled to steps + 1 values while preserving both endpoints.
• The bridge applies no additional smoothing.
• In Impact Pack, the connected scheduler_func_opt replaces the Detailer's scheduler during sampling. The visible scheduler widget remains in the interface, but its selected value is ignored.
• Impact Pack is optional. Dynamic Sigmas does not import or modify it.

Installation

ComfyUI Manager

1. Open ComfyUI Manager.
2. Search for ComfyUI-Dynamic-Sigmas in Custom Nodes Manager.
3. Install it and restart ComfyUI.

Manual installation

Run the following from the ComfyUI custom_nodes directory:

git clone https://github.com/cozdx1/ComfyUI-Dynamic-Sigmas.git
cd ComfyUI-Dynamic-Sigmas
pip install -r requirements.txt

Restart ComfyUI after installation or update.

Updating

cd ComfyUI/custom_nodes/ComfyUI-Dynamic-Sigmas
git pull
pip install -r requirements.txt

See CHANGELOG.md for release details.

Compatibility notes

• Workflows saved with v1.0.x load in custom mode while preserving their previous curve data and behavior.
• Dynamic inputs and outputs are currently limited by ComfyUI's subgraph handling. Expand them on the main graph before converting a node to a subgraph.
• Appropriate sigma values vary by model and sampler. Dynamic Sigmas does not validate whether a custom schedule is suitable for a particular sampling setup.
• The Detailer bridge adapts the supplied curve to the step count requested by the receiving node. Verify the effective denoise range when replacing an established Detailer scheduler.

License

MIT License