What is FLUX.1 Krea?

FLUX.1 Krea is an open-source, 12 billion-parameter generative AI model designed for photorealistic image synthesis with fine-grained aesthetic control. Developed in collaboration with Black Forest Labs, FLUX.1 Krea was trained in two stages: first on a diverse “flux-dev-raw” foundation, then refined via supervised fine-tuning on curated high-quality images, followed by reinforcement learning from human feedback (RLHF). The result is a model that avoids common “AI look” artifacts—such as blurred backgrounds or unnatural textures—while delivering coherent, visually compelling outputs aligned to your creative vision.

Key Features

• 12 B Parameter Foundation: Rich representation capacity for complex scenes and nuanced styles.
• Two-Stage Post-Training: Supervised fine-tuning on premium imagery plus RLHF to boost style fidelity and robustness.
• Aesthetic Control: Adjustable guidance scale (0–10) ensures you can trade off creativity for prompt adherence.
• Reproducibility: Use the seed parameter (default 42) to generate identical results across runs.
• Flexible Resolution: Choose megapixels (0.25 for speed, 1 for high-res) and aspect_ratio presets (e.g., 16:9, 1:1).
• Performance Modes: Toggle go_fast for quicker, less deterministic renders or disable for full-quality outputs.
• Safety Checker: Optionally disable content filtering to maximize creative freedom (disable_safety_checker=false by default).

Best Use Cases

• Concept Art & Illustration: Rapidly explore styles and compositions for storyboards, comics, and books.
• Product & Packaging Mockups: Generate photorealistic renders to visualize prototypes without a camera.
• Marketing & Advertising Assets: Craft cohesive imagery for campaigns, social media, and landing pages.
• Architectural & Interior Visualization: Produce lifelike room layouts and exterior shots aligned to design specs.
• UI/UX Backgrounds & Assets: Create seamless textures, patterns, and environment renders for digital products.

Prompt Tips and Output Quality

1. •Craft concise yet evocative prompts: “A sleek Tesla-inspired electric vehicle parked by a neon-lit cyberpunk cityscape.”
2. •Guidance Scale: Start at around 7 for balanced creativity and accuracy; increase toward 10 for strict adherence.
3. •Inference Steps: 40 steps (default) strikes a good quality/speed balance; raise up to 50 for maximum detail.
4. •Seed Consistency: Lock the seed parameter to reproduce results; omit or randomize for novel variations.
5. •Megapixels & Aspect Ratio: Use 1 MP for high fidelity or 0.25 MP to speed up; set aspect_ratio to match your layout.
6. •Image Conditioning: Supply an initial image URI for img2img workflows; adjust prompt_strength (0–1) to control transformation.

FAQs

Q: Is FLUX.1 Krea fully open-source?
Yes. The model weights, training scripts, and documentation are available under an open-source license.

Q: How do I avoid “blurry” outputs?
Increase num_inference_steps and set megapixels to 1. Higher guidance (8+) also sharpens details.

Q: Can I generate multiple images per prompt?
Use num_outputs (1–4). Generating 2–4 variants helps you choose the best composition.

Q: What formats does FLUX.1 Krea support?
Select output_format from jpg, png, or webp. JPEG is default for balanced quality and file size.

Q: How does RLHF improve results?
Reinforcement learning from human feedback refines style consistency, reduces artifacts, and aligns outputs with aesthetic preferences.

FLUX.1 Krea Quickstart Guide

Unlock the full power of FLUX.1 Krea—our 12 B-parameter, photorealistic text-to-image model—by calibrating prompts and parameters for your creative goals. Below are best practices, parameter recommendations, and presets for common use cases.

1. Prompt Crafting

• •Be concise yet descriptive: “A high-fashion editorial shot of a model in avant-garde neon armor, studio lighting.”
• •Specify style, mood, lighting, and elements: e.g., “dramatic chiaroscuro,” “wide-angle,” “icy blue palette.”
• •Iterate and refine: Start broad, then add/remove adjectives to dial in the aesthetic.

2. Core Parameters

3. Use-Case Presets

1. •

   Concept Art & Illustration
   • guidance: 6.5 | steps: 45 | mp: 0.25 | aspect: 3:2 | go_fast: true
   • Fast iterations & painterly freedom.

2. •

   Product Mockups & Advertising
   • guidance: 8.5 | steps: 50 | mp: 1 | aspect: 4:5 | go_fast: false
   • Sharp details, strict prompt adherence, print-ready.

3. •

   Architectural & Interior Renders
   • guidance: 7.5 | steps: 50 | mp: 1 | aspect: 16:9 | go_fast: false
   • Realistic lighting, perspective-correct compositions.

4. •

   UI/UX Backgrounds & Textures
   • guidance: 6 | steps: 40 | mp: 0.25 | aspect: 21:9 | go_fast: true
   • Seamless, abstract patterns with design flexibility.

4. Pro Tips & Workflow

1. •Batch Generation: Set num_outputs (2–4) to explore variations at once.
2. •Seed Tweaks: Increment by one between runs to “walk” the latent space.
3. •Img2Img Transformation: Supply an image URI and adjust prompt_strength (0.3–0.7) for controlled edits.
4. •Output Format & Quality: Choose png+100 quality for master assets; jpg+90 for web previews.
5. •Safety Checker: Only disable (true) in trusted environments or artistic studies.

With these guidelines, you’ll achieve razor-sharp fidelity or painterly freedom as you need—harness FLUX.1 Krea for every stage of your visual pipeline. Happy generating!

FAQs