ComfyUI_UltimateSGUpscale
Tiled upscaling for ComfyUI using built-in nodes. Replicates the core features of UltimateSDUpscale as a transparent workflow you can inspect and modify.
Requirements
- ComfyUI with
SplitImageToTileListandImageMergeTileListnodes (added in PR #12599)
Installation
Clone into your ComfyUI custom_nodes directory:
cd ComfyUI/custom_nodes
git clone https://github.com/ethanfel/ComfyUI_UltimateSGUpscale.git
This installs one custom node (Generate Seam Mask) and provides an example workflow.
What's Included
Example Workflow
example_workflows/tiled-upscale-builtin-nodes.json — a two-pass tiled upscaling workflow:
Pass 1 — Tiled Redraw: Upscales the image with a model (e.g. 4x-UltraSharp), splits it into overlapping tiles, runs each tile through KSampler, then merges them back with sine-based blending.
Pass 2 — Seam Fix (optional): Generates a mask targeting only the seam regions between tiles, then runs a second tiled denoise pass restricted to those seam bands via SetLatentNoiseMask. Mute or bypass the "Seam Fix" group to skip this pass.
Generate Seam Mask Node
A small helper node that creates a binary mask image with white bands at tile seam positions. It replicates SplitImageToTileList's tiling logic to place bands at the exact center of each overlap region.
Inputs:
| Parameter | Default | Description |
|---|---|---|
| image_width | 2048 | Image width (connect from GetImageSize) |
| image_height | 2048 | Image height (connect from GetImageSize) |
| tile_width | 1024 | Tile width matching Pass 1 |
| tile_height | 1024 | Tile height matching Pass 1 |
| overlap | 128 | Overlap matching Pass 1 |
| seam_width | 64 | Width of seam bands in pixels |
Output: IMAGE — a mask with white bands at seam positions, black elsewhere.
How It Works
The workflow chains standard ComfyUI nodes together. SplitImageToTileList outputs a list, and ComfyUI's auto-iteration runs all downstream nodes (VAEEncode, KSampler, VAEDecode) once per tile automatically. Scalar inputs (model, conditioning, VAE) are reused across tiles. ImageMergeTileList reassembles tiles using sine-weighted blending for smooth overlap transitions.
The seam fix pass uses SetLatentNoiseMask to restrict denoising to only the masked seam regions, leaving the rest of the image untouched.
License
MIT