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

Channel Ops preview

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 Ops

Layer Blending Ops preview

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 |

Filter Ops

Filter Ops preview

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 Ops

Color Matching Ops preview

Recolors image so its color statistics match a reference image. Two image inputs, one image output. Inputs may be any size — matching is statistics-only, so no resizing is needed.

| 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 |

| target | What it keeps (split in Oklab; rest comes from the original) | |---|---| | All (default) | Full color match | | Lightness | Match the reference tonality, keep the original colors | | Color | Match the reference grade, keep the original tonality |

License

MIT