HiDreamO1PatchSeamSmoothing - ComfyUI Built-in Node Documentation

This node reduces visible seams in images generated by the HiDream-O1 model by averaging the model’s output across multiple shifted patch-grid positions during the later part of th

This node reduces visible seams in images generated by the HiDream-O1 model by averaging the model’s output across multiple shifted patch-grid positions during the later part of the sampling process. It works by running the model several times with slightly different image alignments and blending the results together, which helps cancel out the grid-like artifacts that can appear at patch boundaries.

Inputs

Parameter	Description	Data Type	Required	Range
model	The HiDream-O1 model to apply seam smoothing to.	MODEL	Yes	-
start_percent	The sampling progress (0=start, 1=end) at which the smoothing effect turns ON (default: 0.8).	FLOAT	Yes	0.0 to 1.0 (step: 0.01)
end_percent	The sampling progress at which the smoothing effect turns OFF (default: 1.0).	FLOAT	Yes	0.0 to 1.0 (step: 0.01)
pattern	The layout of the shifted grid positions. single_shift: one pass at the natural patch grid plus others offset. symmetric: all passes are off-grid, with shifts split around the origin (default: "single_shift").	COMBO	Yes	"single_shift" "symmetric"
passes	The number of passes (model runs) per gated step. 2 or 4 are fixed counts. ramp_2_4 and ramp_2_4_8 increase the pass count as sampling approaches the end, providing more smoothing where seams are most visible (default: "2").	COMBO	Yes	"2" "4" "ramp_2_4" "ramp_2_4_8"
blend	The method used to combine the results from each pass. average: equal-weight mean of all passes. window: uses a Hann window to give more weight to the center of each pass, reducing boundary artifacts. median: takes the per-pixel median, which can reject outlier passes caused by wraparound (default: "average").	COMBO	Yes	"average" "window" "median"
strength	Controls the interpolation between the original model output (0.0) and the fully smoothed result (1.0) (default: 1.0).	FLOAT	Yes	0.0 to 1.0 (step: 0.01)

Note on Parameter Constraints:

• The smoothing effect will not be applied if strength is 0.0 or less, or if end_percent is less than or equal to start_percent. In those cases the node returns the model unchanged.
• The passes parameter’s ramp options (ramp_2_4, ramp_2_4_8) are only meaningful when start_percent and end_percent define a range, as the number of passes increases as sampling progresses through that range.

Outputs

Output Name	Description	Data Type
model	The modified model with the seam smoothing wrapper applied.	MODEL

This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! Edit on GitHub

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