MaskPreview - ComfyUI Built-in Node Documentation

The MaskPreview node saves mask data as a preview image to your ComfyUI output directory, allowing you to visually inspect mask data during workflow execution. It converts the input mask into a format suitable for image display and saves it with a configurable filename prefix.

Inputs

Parameter	Description	Data Type	Required	Range
`mask`	The mask data to be previewed and saved as an image	MASK	Yes	-
`filename_prefix`	Prefix for the output filename (default: “ComfyUI”)	STRING	No	-
`prompt`	Prompt information for metadata (automatically provided)	PROMPT	No	-
`extra_pnginfo`	Additional PNG information for metadata (automatically provided)	EXTRA_PNGINFO	No	-

Outputs

Output Name	Description	Data Type
`ui`	Contains the preview image information and metadata for display in the UI	DICT

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MaskComposite - ComfyUI Built-in Node Documentation

MaskToImage - ComfyUI Built-in Node Documentation

​Inputs

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Inputs

Outputs