A custom ComfyUI node that provides a dropdown menu of preset resolutions for film and photography aspect ratios. These resolutions are optimized for models with a native resolution of 1024x1024, such as Z-Image Turbo, SDXL, Pony, and Flux.

Preview

Features

Preset Resolutions: Select from a curated list of common aspect ratios and resolutions.
Easy to Use: Simply select a preset from the dropdown to output the corresponding width and height.
Customizable: The list of resolutions can be easily modified in the Python script.

Installation

Clone or download this repository into your ComfyUI/custom_nodes/ folder.
Restart ComfyUI.

Usage

Add the "AfterDark Film AR Selector" node to your workflow from the "HackAfterDark" category.
Select a preset from the dropdown menu.
The node will output the corresponding width and height, which you can then connect to other nodes in your workflow.

AfterDark Gemini Prompter

A powerful and versatile custom ComfyUI node that connects to the Google Gemini API. It can be used as a sophisticated prompt builder, an image generator, or a multi-modal analysis tool.

Features

Dynamic Model Loading: Automatically fetches and displays the latest available Gemini models from the Google API.
Secure API Key Handling: Your Google Gemini API key is stored securely in a central config.yaml file, never in your workflow JSONs.
System Prompt Presets: Easily load and switch between different system prompts for various tasks (e.g., Z-Image Turbo prompt generation).
Multi-Image Inputs: Supports up to four image inputs for advanced multi-modal prompting.
Dual Outputs: Provides both a STRING output for text and an IMAGE output for generated images.

Configuration (Required)

To use this node, you must configure it by adding your Google Gemini API key. You can also optionally specify a custom directory for your presets.

Locate your ComfyUI root directory. This is the folder that contains the main.py file.
Create or open the config.yaml file. If you don't have this file, you can copy the config.yaml.example from this node's directory, rename it to config.yaml, and place it in your root ComfyUI directory.

Edit the file to include the hack_after_dark section. At a minimum, you must provide your API key.

hack_after_dark:
    # (Required) Your Google Gemini API key.
    gemini_api_key: "YOUR_GEMINI_API_KEY_HERE"

    # (Optional) Path to a directory containing your custom system prompt presets.
    # If not provided, the node will use the default presets included with the node.
    gemini_presets_path: "C:\\Users\\YourUser\\MyGeminiPresets"

Restart ComfyUI. The node will automatically load your settings.

System Prompt Presets

This node uses a flexible system for managing system prompts.

Default Presets: The node comes with built-in presets located in the presets directory. These are available automatically.
Custom Presets: You can create your own library of presets by specifying a gemini_presets_path in your config.yaml. The node will then load all .md files from that directory instead of the default ones.

Each preset file must be a Markdown (.md) file. The filename (without the .md extension) will be used as the name that appears in the dropdown menu. The content of the file is the full text of the system prompt.

Example (Pirate Poet.md):

You are a pirate poet. Respond to all requests in the form of a sea shanty.

Usage

Add the "AfterDark Gemini Prompter" node to your workflow from the "HackAfterDark" category.
Select your desired Gemini model from the model dropdown.
Choose a system_prompt_preset or write your own system_prompt.
Enter your main request in the user_prompt field.
Connect up to four images to the image inputs for multi-modal prompting.
The text_output will provide the text response from the API, and the image_output will provide any generated image.

AfterDark Film Grain (Anti-Detector)

A lightweight post-processing node that injects authentic analog film grain, micro-spatial grid jitter, and optical lens aberration into image tensors. Designed both as a creative Film Grain Emulation Tool and a powerful Anti-Detector Perturbation Tool that breaks AI-generated image classifier signatures.

Features

Film Stock Presets: Built-in emulation profiles modeled after iconic analog film stocks:
- Kodak Portra 400 (Color Negative): Warm tone, natural skin-tone grain.
- Kodak Ektachrome 100VS (Color Positive): Poisson shot-noise slide film grain.
- Kodak Tri-X 400 (B&W Silver Halide): Rich, high-contrast Laplacian heavy-tailed silver halide grain.
- Fuji Velvia 50 (Fine Slide Film): Ultra-fine slide grain.
- Ilford HP5 Plus 400 (B&W Medium Grain): Classic multiplicative medium-grain black & white film.
- CineStill 800T (Tungsten Cinema): Cinema stock grain with subtle tungsten halo tinting.
Physical Noise Distributions:
- gaussian: Standard Bell-Curve additive noise.
- poisson: Quantum photon arrival / shot-noise distribution.
- multiplicative: Signal-proportional film dye & sensor noise.
- laplacian: Heavy-tailed organic silver halide grain spikes.
Film Format Scaling: Choose format scale (35mm, Medium Format 6x6, Large Format 4x5) to automatically adjust relative grain coarseness.
DxO-Style Controls:
- noise_level (Grain Intensity)
- grain_size (Grain Size multiplier)
- micro_jitter (Sub-pixel VAE grid lattice disruption)
- chromatic_aberration (Lens color fringing)
- luminance_weight (Mid-tone / Shadow signal-dependent noise)
Seed & Reproducibility: Optional integer seed input to ensure deterministic noise outputs across runs when desired.

Usage

Add the "AfterDark Film Grain (Anti-Detector)" node to your workflow from the HackAfterDark category.
Select your desired film_preset (or leave as "None (Manual)" for custom tuning).
Choose your film_format (35mm, Medium Format 6x6, Large Format 4x5).
Adjust noise_level (Intensity) and grain_size to taste.

Credits

Author: HackAfterDark (https://hackafterdark.com)

Follow me on Civitai! https://civitai.com/user/HackAfterDark