AdjustBrightness - ComfyUI Built-in Node Documentation - ComfyUI

The Adjust Brightness node changes how bright an image looks. It multiplies the image’s color values by a factor and keeps the results within the valid 0.0 to 1.0 range. A factor of 1.0 leaves the image unchanged, values below 1.0 make it darker, and values above 1.0 make it brighter.

Inputs

Parameter	Description	Data Type	Required	Range
`image`	The input image to adjust. Accepts a single image or a batch of images.	IMAGE	Yes	-
`factor`	Brightness factor. 1.0 = no change, <1.0 = darker, >1.0 = brighter. (default: 1.0)	FLOAT	No	0.0 - 2.0

Note: If the input image has an alpha channel (RGBA), only the color channels are adjusted. The alpha channel is copied from the input unchanged because it stores transparency, not color.

Outputs

Output Name	Description	Data Type
`image`	The output image with adjusted brightness. If the input has an alpha channel, the alpha values remain unchanged.	IMAGE

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