ComfyUI Channel Ops (live-preview)
Four custom nodes for per-channel image manipulation, layer blending, image filters, and color matching — all with in-node live preview and optional MASK input.
Channel Ops
Per-channel operations across RGB / HSV / Oklab. Destination only affects Overwrite ops. mask input restricts the effect to the masked region.
| Operations | Sources / Destinations |
|---|---|
| Invert · Set · Add · Subtract · Multiply · Divide | Red · Green · Blue |
| Clamp Min · Clamp Max · Truncate · Contrast | Red+Green · Red+Blue · Green+Blue |
| Overwrite · Overwrite from Image | Hue · Saturation · Value · RGB · HSV · Oklab |
Layer Blending
Composites two images with a blend mode + opacity (0–255). Foreground bilinearly resized to background H×W; batches align to min(B); output clamped to [0, 1].
| Blend modes |
|---|
| Normal · Multiply · Screen · Overlay |
| Soft Light · Hard Light · Darken · Lighten |
| Color Dodge · Color Burn · Linear Dodge (Add) · Linear Burn |
| Vivid Light · Linear Light · Pin Light · Hard Mix |
| Difference · Exclusion · Add · Subtract · Divide |
| Darker Color · Lighter Color |
Filter Ops
Adaptive widget UI — only the controls relevant to the current effect are shown. effect + blend_mode always visible. mask input restricts the effect to the masked region. Custom widgets (color wheels, histogram, vignette center) mirror the underlying numeric values both ways.
| Effect | Key params |
|---|---|
| Blur | blur_mode (Gaussian / Average / Edge Average), radius, source |
| Halftone | shape (12 patterns), size, angle + angle wheel, contrast, brightness, inverse — Bayer-dithered |
| Color Filter | hue, density, preserve_highlights + HSV color wheel |
| Sharpen | amount (negative = soften), radius, threshold |
| Laplacian Sharpen | amount, kernel (3×3 4-neighbor / 8-neighbor) — edge boost via the Laplacian operator |
| Unsharp Masking | amount (multiplier), radius (Gaussian), threshold — classic unsharp mask |
| Pixelate | size, mode (Pixelate / Mosaic adds grout lines) |
| Posterize | levels, mode (RGB / Luminance), dither_mode (None / Bayer / Random / Floyd-Steinberg / Atkinson), dither strength |
| Vignette | amount, size, feather, roundness + draggable center widget |
| Levels | channel, in/out black/white, gamma + histogram widget with B/γ/W handles |
| Color Balance | 3 color wheels (Shadows / Midtones / Highlights); hue = tint direction, distance = intensity |
Color Matching
Recolors image so its color statistics match a reference image. Two image inputs, one image output.
| Method | What it does |
|---|---|
| LAB (default) | Mean/std (Reinhard) transfer in the perceptual Oklab space |
| RGB | Mean/std transfer applied directly per RGB channel |
| Histogram | Per-channel cumulative-distribution (CDF) matching |
License
MIT