The "radial mask" mode is particularly useful for e.g. preparing game assets. It is inspired by the closed-source technique of the following free web tool:

https://www.imgonline.com.ua/eng/make-seamless-texture.php

To my knowledge, this extension is the only offline, open-source variation of that technique and it does produce very similar results.

[!TIP] If you're looking to generate textures from scratch: I recommend using a modern architecture like Flux Klein 4b or Z-Image Turbo with ComfyUI-seamless-tiling's circular VAE decoding. However, this may still produce seams and uneven lighting - so you'll want to correct the results with the Seamless Texture Pre-Processor + Radial Mask.

Installation

Use ComfyUI Manager or clone this repo into custom_nodes.
Restart ComfyUI after installing.

Seamless Texture Pre-Processor

Pre-crop and optional lighting correction to reduce large-scale brightness gradients before making a texture seamless.

Inputs

image: Image to pre-process.
pre_crop_left: Pixels to crop from the left edge.
pre_crop_top: Pixels to crop from the top edge.
pre_crop_bottom: Pixels to crop from the bottom edge.
pre_crop_right: Pixels to crop from the right edge.
lighting_correction_intensity: Strength of lighting correction (0 disables).
lighting_correction_radius: Blur radius used for lighting correction.

Outputs

IMAGE: The pre-processed image.

Seamless Texture Radial Mask

Offset-and-blend method with a radial mask that preserves the center and blends the edges.

Inputs

image: Image to make seamless.
inner_radius: Normalized radius where blending starts. 0 = center, 1 = edge.
outer_radius: Normalized radius where blending ends (values > 1 blend past the edge).
scatter_strength: Adds organic waviness to the blend boundary.
blend_curve: Blend curve for the transition. Options: "cosine", "linear", "smoothstep", "smootherstep", "quadratic", "cubic".

Outputs

IMAGE: The seamless texture.

Seamless Texture Half Shift

Half-shifted blend with simpler seam transitions and optional axis control.

Inputs

image: Image to make seamless.
inner_radius: Normalized distance where blending starts.
outer_radius: Normalized distance where blending ends.
blend_curve: Blend curve for the transition.
orientation: Shift direction: "both", "horizontal", or "vertical".

Outputs

IMAGE: The seamless texture.

Seamless Texture Mirrored Collage

Mirrored quadrant collage that produces seamless results with visible symmetry.

Inputs

image: Image to make seamless.
blend_curve: Blend curve for smoothing the center cross seam.

Outputs

IMAGE: The seamless texture.

Seamless Texture Tiled Preview

Tiles any image into a preview grid and optionally draws seam markers.

Inputs

image: Image to preview.
tile_preview_width: Number of horizontal tiles.
tile_preview_height: Number of vertical tiles.
seam_marker_color: Seam marker color. Supports hex ("#FF0000"), rgb("rgb(255,0,0)"), rgba("rgba(255,0,0,0.5)"), or color names ("red", "blue"). Leave empty to disable.

Outputs

IMAGE: The tiled preview image.

Dependencies: torch (as provided by ComfyUI).