ComfyUI ProPost

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 five nodes at the moment, but we plan to add more over time.

Installation

The easiest way is using the ComfyUI Manager to install this package. Just search for propost and click install.

Manual Installation

• Navigate to the /ComfyUI/custom_nodes/ folder
• Run git clone https://github.com/digitaljohn/comfyui-propost.git
• Run pip install -r requirements.txt
• 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.
center_x	0.5	Float	The x-coordinate of the center of the vignette. 0.0 to 1.0.
center_y	0.5	Float	The y-coordinate of the center of the vignette. 0.0 to 1.0.

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
blur_strength	64.0	Float	The intensity of the blur at the edges, with a range of 0.0 to 256.0.
center_x	0.5	Float	The x-coordinate of the center of the blur. 0.0 to 1.0.
center_y	0.5	Float	The y-coordinate of the center of the blur. 0.0 to 1.0.
focus_spread	1.0	Float	The spread of the area of focus. A larger value makes more of the image sharp.
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.

Depth Map Blur

This filter allows you to blur the image based on a depth map. You can use this in combination with the existing Depth Map nodes like Depth Anything or MiDaS etc.

Example workflow

Parameter	Default	Type	Description
depth_map	n/a	Image	The depth map to use for the blur.
blur_strength	64.0	Float	The intensity of the blur, with a range of 0.0 to 256.0.
focal_depth	1.0	Float	The focal depth of the blur. 1.0 is the closest, 0.0 is the farthest.
focus_spread	1.0	Float	The spread of the area of focus. A larger value makes more of the image sharp.
steps	5	Integer	The number of steps to use when blurring the image. Higher numbers are slower.

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.

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

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.

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 all the effects combined to create a more controlled and striking image.

Example

Check out this workflow below, which uses the Film Grain, Vignette, Radial Blur, and Apply LUT nodes to create the image above. Just drag the image into ComfyUI.