ComfyUI-PostFx

Theme-based film-emulation & post-processing nodes for ComfyUI, powered by the postfx pipeline — film stocks, cinematic grades and .cube LUTs, defined in YAML, running on the CPU (no GPU, no ML). Pick a look, dial a shooting condition and a global strength, and every image gets the same consistent, reusable visual identity.

Install

ComfyUI-Manager: search for ComfyUI-PostFx and install.

Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/0xBeycan/ComfyUI-PostFx.git
pip install -r ComfyUI-PostFx/requirements.txt   # installs the `postfx` package

Restart ComfyUI. The nodes appear under the PostFx category.

Nodes

Node	In → Out	What it does
PostFx Apply	IMAGE (+ look, mask) → IMAGE	The core node. Applies a theme + condition + strength to an image batch. A connected look overrides the theme dropdown; an optional mask limits the effect to the masked region.
PostFx Theme	→ LOOK	Emits a built-in theme as a look, to start a chain from a named theme.
PostFx Custom Look	(look) → LOOK	Build a look from common controls (white balance, exposure, contrast, vibrance/saturation, grain, vignette, halation, clarity). With a look input, only the knobs you move off neutral override it.
PostFx LUT	(look) → LOOK	Attach a 3D .cube LUT. Standalone by default; connect a look to layer the LUT on top of a theme.
PostFx Signature Sheet	IMAGE → IMAGE	Labeled contact-sheet grid of every theme in a category — quick side-by-side comparison.

LOOK = POSTFX_LOOK, the link type carried between the look-producing nodes and PostFx Apply. Every look node has an optional look input, so they chain in any order.

Usage

Simple — one theme:

Load Image → PostFx Apply (theme = portra_400) → Save Image

Advanced — a theme, your own LUT, extra grain, a night condition:

PostFx Theme (portra_400)
   → PostFx LUT (my_look.cube)
   → PostFx Custom Look (grain ↑)
   → PostFx Apply (condition = neon_night, strength = 1.0)
   → Save Image

Concepts (from postfx)

• Theme = the look (color/grain/lens), defined in YAML. 15 signature (real film stocks & industry grades: Portra 400, Cinestill 800T, Kodachrome, teal-orange…) + 15 experimental.
• Condition = a separate axis. It scales only the texture (grain, chroma noise, halation) for the shooting situation — neutral, day_outdoor, overcast, indoor_evening, neon_night, night_flash. It does not change color, so one theme stays consistent across conditions.
• Strength 0.0–1.5 — linearly blends the whole effect with the original (0 = untouched, 1 = full, >1 = over).
• Seed — grain is deterministic. batch_seed = increment gives a different grain per frame across a batch; fixed uses one seed for all.
• Deterministic & resolution-safe — no crop/resize; grain/blur scale with image size, so a look reads identically at any resolution.

LUTs

Drop .cube 3D LUTs into this repo's luts/ folder to see them in the PostFx LUT dropdown, or point its lut_path at any absolute path. A LUT applies mid-pipeline (display/sRGB space), so a theme's color grade runs before it and grain/vignette/sharpen finish on top.

License

MIT © 0xBeycan · built on postfx.