FILM GRAIN (Hybrid Checkpoint) — Official Technical Datasheet

The Convergence of Biological Truth and Analog Soul.

What is the FILM GRAIN Model?

The FILM GRAIN model is a next-generation hybrid checkpoint developed on top of the Flux architecture. It was engineered to definitively break the barrier of the polished, overly digital look typically produced by generative artificial intelligence (the AI look). It seamlessly unites the most advanced anatomical precision on the market with the raw texture and organic imperfections of analog chemical photography.

Rather than a simple overlay of uniform noise, FILM GRAIN reconstructs the latent diffusion process so that the grain structure and high-frequency dermal textures are generated natively and indissociably. This transforms every rendering into a raw, tactile photographic capture reminiscent of medium or large-format film.

Fusion Architecture & Weight Engineering

This model was constructed through a complex network merging and calibration process, combining three fundamental pillars of the Flux Dev base:

• Base Biological Engine (HUMAN — Flux Dev): Utilizes the HUMAN checkpoint as its structural foundation, inheriting its specialized calibration for bone mapping, muscle placement, natural asymmetry, and advanced optical physics for human tissue and eyes.

• The Micro-Texture Chisel (4-LoRA Merge): Integrates 4 specialized LoRA modules distributed across a scaling dimensionality from Rank 2 to Rank 128. The low-rank modules control the overall atmosphere and light interaction, while the high-rank layers (up to 128) inject the high-frequency micro-data necessary to lock in genuine pore structures and silver halide grain definitions within the dermis.

• Contrast and Convergence Velocity Injection (30% Flux Schnell): A direct 30% merge of the Flux Schnell base. This layer aggressively cleans up diffusion artifacts, accelerates step convergence, and infuses a stark "reality shock" into the scene's contrast and exposure latitude—delivering rich, deep blacks and sharp shadows native to physical camera sensors.

Core Features & Technical Highlights

1. Luminance-Reactive Analog Grain

The grain operates with physical accuracy relative to the scene's illumination. It distributes more densely and coarsely within shadow zones and dark gradients (simulating film emulsion under lower light), while remaining fine, clean, and subtle in high-exposure highlights. This grain structure propagates seamlessly into out-of-focus background elements (bokeh), eliminating flat digital blurs and establishing a cohesive cinematic atmosphere.

2. Absolute High-Frequency Preservation

Unlike standard post-processing noise filters that degrade image clarity, FILM GRAIN sustains surgical sharpness underneath its textured grain layer. Microscopic elements—such as the natural pore distribution on cheeks and the nose bridge, fine facial vellus hair, light expression lines, lip tissue ridges, and individual hair strands—are preserved with extreme tactile tridimensionality.

3. Optical Simulation & Subsurface Scattering

The model masterfully replicates the optical physics of fast prime lenses (such as 85mm f/1.4 or 135mm f/2). It natively handles complex light propagation, accurately simulating subsurface scattering (SSS) where light penetrates thin human tissue in backlit or golden hour environments. Specular highlights across skin sweat zones and the moist surface of the eyes (catchlights) react perfectly to the physical direction of light sources.

4. Environment and Physics Versatility

Demonstrates complete consistency when transitioning between high-fashion studio editorial portraits with softboxes, casual phone-style perspective framing (emulating wide-angle front-facing smartphone camera lenses), and highly complex low-light night scenes featuring fog, wet brick surfaces, and complementary chromatic reflections (Teal & Orange).

Recommended Generation Settings

To extract the maximum potential of skin texture and analog grain fidelity from this hybrid architecture, use the following parameters:

Sampler Configurations

• Sampling Method (Sampler): Euler or Euler a

• Schedule Type: Simple or Beta

• Sampling Steps: 16 to 30 steps (optimized via the 30% Schnell architecture integration)

• Distilled CFG Scale: 3.5 to 8.0

• Clip Skip: 0

Recommended Native Resolutions

• Standard Vertical Portrait: 640 x 960

• Mid Portrait: 600 x 800

• Compact Frame: 512 x 640

• High-Resolution Mode (Hi-Res Fix): Generate natively at 540 x 540 pixels with a 2x latent or upscale resize to hit a final target resolution of 1080 x 1080 pixels.

Prompting Guidelines

Due to the deep biological and photographic understanding inherited from its core components, this model requires minimal prompting to achieve professional-grade results.

• Avoid redundant buzzwords: Do not bloat your prompts with generic tags like "hyperrealistic", "4k", "8k", or "photorealistic".

• Focus on environmental composition: Simply describe your subject (phenotype, expression, clothing), the location, and specific lighting conditions (e.g., golden hour rim lighting, studio softbox setup, low-key street photography). FILM GRAIN will autonomously calculate the appropriate skin texture scale, optical lens behavior, and dynamic grain structure required for that specific mood.

⚠️ IMPORTANT — Compatibility Notice

This checkpoint was developed and tested exclusively in ComfyUI.

Use only with ComfyUI for guaranteed results.

Versions of Stable Diffusion WebUI (AUTOMATIC1111) and Stable Diffusion Forge are not recommended and may present failures, artifacts, incorrect generations, or unexpected behavior.

The author does not provide support for generations made outside the ComfyUI environment.

✅ Recommended: ComfyUI ❌ Not supported: AUTOMATIC1111 / Forge / other WebUI variants

⚠️ CONTENT WARNING (NSFW):

This merge is uncensored and capable of generating high-quality explicit NSFW content and nudity. It has a tendency towards revealing clothing in casual settings.

• For SFW results: Strong negative prompts are highly recommended (e.g., nude, nipples, explicit, nsfw).

⚠️ LICENSE & PERMISSIONS (READ BEFORE DOWNLOADING)

1. PERSONAL USE ONLY This model is provided free of charge for Personal, Non-Profit, and Research use only. You may use it to create images for your personal portfolio.

2. STRICTLY NO REDISTRIBUTION

• ❌ DO NOT re-upload this file to Civitai, Hugging Face, or any other platform.

• ❌ DO NOT host this model on third-party generation services (e.g., Tensor.art, Mage.space, Telegram Bots).

3. COMMERCIAL RESTRICTIONS Using this model or its outputs for commercial revenue (Influencers, Ads, Stock Photos) without a license is PROHIBITED.

💼 COMMERCIAL SERVICES & COMMISSIONS

I do not sell the model file for commercial use. Instead, I offer premium AI solutions for brands and agencies:

• ✨ Exclusive AI Influencers: I create and manage consistent digital personas for Instagram/Social Media.

• 🏢 Corporate B2B LoRAs: Custom training for brand identity and mascots.

• 📸 High-End Image Packs: Monthly content packages for your brand.

To hire me for professional AI Modeling services: 📩 Contact: [[email protected]]