ComfyUI Pro Post

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.

Installation

• Navigate to the /ComfyUI/custom_nodes/ folder
• Run git clone https://github.com/digitaljohn/comfyui-propost.git
• Restart ComfyUI

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.

Radial Blur

This filter allows you to blur the edges of the image. It has a few different options that allows you to accomplish a variety of effects.

Parameter	Default	Type	Description
edge_blur_strength	64.0	Float	The intensity of the blur at the edges, with a range of 0.0 to 200.0.
center_focus_weight	1.0	Float	How focused the blur is. A smaller value pinches the blur towards the center.
steps	5	Integer	The number of steps to use when blurring the image. Higher numbers are slower.

Note: Using steps set to 1 can create some dreamy effects as seen below with a high edge_blur_strength.

Apply LUT

This filter allows you to apply a 3D LUT to the image. Currently it only supports 3D LUTs in the CUBE format. Upon installation, a sub-folder called luts will be created inside /ComfyUI/models/. I know it's not strictly a 'model', but it was the best place to put it for now. You can place your .cube files in this folder and they will be listed in the node's dropdown.

Parameter	Default	Type	Description
lut_name	n/a	LUT	The *.cube from the luts folder to apply to the image.
strength	1.0	Float	The strength of the LUT effect, with a range of 0.0 to 1.0.
log	false	Boolean	If true, the image is processed in LOG color space.

Here we apply a lut called Waves.cube to the image in LOG color space.

Note: This code is a heavily inspired from BilboX's work here: https://github.com/syllebra/bilbox-comfyui

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!