A set of custom ComfyUI nodes for performing basic post-processing effects. These effects can help to take the edge off AI imagery and make them feel more natural. We only have two nodes at the moment, but we plan to add more over time.

Nodes

Film Grain

A film grain effect with many parameters to control the look of the grain. It can create different noise types and patterns, and it can be used to create a variety of film grain looks.

Parameter	Default	Type	Description
gray_scale	`false`	Boolean	Enables grayscale mode. If true, the output will be in grayscale.
grain_type	`Fine`	String	Sets the grain type. Values can be Fine, Fine Simple, Coarse, or Coarser.
grain_sat	`0.5`	Float	Grain color saturation, with a range of 0.0 to 1.0.
grain_power	`0.7`	Float	Overall intensity of the grain effect.
shadows	`0.2`	Float	Intensity of grain in the shadows.
highs	`0.2`	Float	Intensity of grain in the highlights.
scale	`1.0`	Float	Image scaling ratio. Scales the image before applying grain and scales back afterwards.
sharpen	`0`	Integer	Number of sharpening passes.
src_gamma	`1.0`	Float	Gamma compensation applied to the input.
seed	`1`	Integer	Seed for the grain random generator.

Note: This code is a direct port/lift of the versatile Filmgrainer library available here: https://github.com/larspontoppidan/filmgrainer

Vignette

A simple vignette effect that darkens the edges of the screen. It supports very subtle vignettes, as well as more pronounced ones.

Parameter	Default	Type	Description
intensity	`1.0`	Float	The intensity of the vignette effect, with a range of 0.0 to 10.0.

Putting it all together

Obviously due to the nature of ComfyUI you can compose these effects together. Below is an example of a strong vignette along with a coarse film grain effect.

Example

Check out the sample workflow that was used to generate these sample images here: Pro Post Example Workflow. Have fun!