TBG ETUR Labs for Refiner

ETUR's refiner already fuses tiles, corrects color, and stabilizes drift. The Labs for Refiner node is where the author keeps the stuff that's too new or too opinionated to be a default - the "home for ETUR experimental tools," per the node's own description. It's a config bus: you don't wire images into it, you plug it into the refiner (it's an output node whose labs_refiner pipe the refiner consumes) and it overrides how fusion, inpainting, and color behave.

Most of the inputs default to safe values and can stay that way. The ones worth understanding before you touch them:

The fusion and inpainting guts

• Tile_Fusion_Blend (0.5) - the fusion margin with neighboring tiles. Lower = less risk of overlap artifacts; higher = softer blending but you invite visible seams. This is the "how much of the border region gets re-sampled" dial, and it's the first thing to try if your tiles show hard edges.
• Fusion_end (0, range −50 to 0) - a step from the end after which fusion is skipped. With 20 total steps and −10, fusion runs only from step 1 to 10, then the sampler finishes free. It's a speed/quality trade: fusion is what keeps tiles agreeing, so cutting it early speeds things up but lets tiles drift in the tail.
• Fusion_conditioning (on) - on, fusion uses both conditioning and the noise mask; off, it works with the noise mask alone.
• LanPaint (on) - TBG's "Universal Inpainting Sampler with Think Mode," the split-aware sampler that underlies the fusion. Leave it on; turning it off changes the sampling path entirely.
• Differential_Diffusion (on) - sigma-aware denoising where the mask's allowed region changes as steps progress. This is the same differential diffusion the pack's author wrote whole posts about fixing in ComfyUI (the split-sigma latent-mask bug), so it's genuinely where ETUR's inpainting quality comes from.

The color and reference extras

• Flux2_Tile_Color_Correction (on) - keep on; the refiner expects it unless you're deliberately testing.
• Flux2_Sampler_Hook (off) - off uses the normal VAE encode + Set Latent Noise Mask path; on uses the legacy/private Flux2 differential sampler hook. Unless you know you want the old path, leave it off.
• Color & Structure Stabilizer (0, experimental) - a grid of anchor points that fights color and structure drift across tiles. It's labeled experimental for a reason; try it when tiles slowly wander in color, and don't expect it to fix a broken source.
• cropped_positive / cropped_negative - optional full-image conditioning that ETUR crops per tile, Ultimate SD Upscale style. This is how you get crop-aware prompts without a ControlNet pipe.
• Segment_Background_Harmonization (on) - matches generated segment surroundings to the finished tile canvas, protecting the object core. Off if a segment's background isn't matching.

Plus the plumbing: PID_Model (override the auto-loaded PiD), ColorMatch_Debug (plug in the debug gates node), Custom_Sigmas_!DENOISE=1 (a full sigma curve - denoise is handled per tile, so give it an un-denoised curve), Sampler (override with a custom/ClownSampler), Ideogram4_Guider, stitch_blending (gpupyramid/cpupyramid - the GPU Laplacian pyramid compositor is the default for a reason), max_upscale_size_segment (2048 cap on segment upscale size), and Save_Tiles_in_Temp_Folder (drops full-res tiles into temp/TBG/compareTiles/ for in-process previews).

Installing it

Ships in the TBG ETUR pack:

cd ComfyUI/custom_nodes
git clone https://github.com/Ltamann/ComfyUI-TBG-ETUR
cd ComfyUI-TBG-ETUR
pip install -r requirements.txt

Or ComfyUI Manager → search "TBG" → TBG_Enhanced Tiled Upscaler & Refiner FLUX PRO, restart.

Notes

Treat this node as a debug-and-tune panel, not a daily driver. The defaults are the author's opinion of what works; every knob here trades one artifact for another. The one habit worth adopting: when a refined image has a fusion seam you can't explain, connect Labs for Refiner, cut Fusion_end to something like −10, and watch whether the seam appears in the freed tail steps - that single experiment tells you whether your problem is fusion or sampling. And remember the pack is beta and updated daily; a Labs knob that does nothing today may do something next week. That's the nature of the room.