flux-best-practices

Comprehensive guide for BFL FLUX image generation models. Covers prompting, T2I, I2I, structured JSON, hex colors, typography, multi-reference editing, and model-specific best practices for FLUX.2 and FLUX.1 families.

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Install skill "flux-best-practices" with this command: npx skills add black-forest-labs/skills/black-forest-labs-skills-flux-best-practices

FLUX Best Practices

Use this skill when generating prompts for any BFL FLUX model to ensure optimal image quality and accurate prompt interpretation.

When to Use

  • Creating prompts for FLUX.2 or FLUX.1 models
  • Text-to-image (T2I) generation
  • Image-to-image (I2I) editing with FLUX.2 models
  • Structured scene generation with JSON
  • Typography and text rendering
  • Multi-reference style transfer
  • Color-accurate brand generations

Quick Reference

Prompt Structure Formula

[Subject] + [Action/Pose] + [Style/Medium] + [Context/Setting] + [Lighting] + [Camera/Technical]

Model Selection

Use CaseRecommended ModelNotes
Fastest generationFLUX.2 [klein]4B or 9B, sub-second
Highest qualityFLUX.2 [max]Best detail, grounding search
Production balancedFLUX.2 [pro]Quality + speed
Typography/textFLUX.2 [flex]Best text rendering
Local/developmentFLUX.2 [dev]Open weights
Image editingFLUX.2 [pro/max]Pass image URL directly to input_image
InpaintingFLUX.1 FillObject removal/completion
Context editingFLUX.1 KontextOlder model, prefer FLUX.2

Critical Rules

  1. NO negative prompts - FLUX does not support negative prompts; describe what you want
  2. Be specific - Vague prompts produce mediocre results
  3. Use natural language - Prose/narrative style works best
  4. Specify lighting - Lighting has the biggest impact on quality
  5. Quote text - Use "quoted text" for typography rendering
  6. Hex colors - Use #RRGGBB format with color description

Related

For API integration (endpoints, polling, webhooks), see the bfl-api skill.

Rules Reference

Read individual rule files for detailed guidance:

Example Prompt

A weathered fisherman in his 70s with deep wrinkles and a salt-and-pepper beard,
wearing a navy cable-knit sweater, standing at the helm of his wooden boat.
Golden hour sunlight from the left creates dramatic rim lighting on his profile.
Shot on Hasselblad with 85mm lens at f/2.8, shallow depth of field with harbor
lights creating soft bokeh in the background. Kodak Portra 400 color science.

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Related Skills

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