# FLUX Image Prompting Guide

Gives prompting and editing best practices for BFL FLUX image models.

- Repository: https://github.com/calesthio/OpenMontage (74341 stars)
- Category: Media
- License: AGPL-3.0
- Last updated: 2026-10-28
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add calesthio/OpenMontage --skill flux-best-practices -g -a claude-code -y`
Codex: `npx skills add calesthio/OpenMontage --skill flux-best-practices -g -a codex -y`
Cursor: `npx skills add calesthio/OpenMontage --skill flux-best-practices -g -a cursor -y`
Gemini CLI: `npx skills add calesthio/OpenMontage --skill flux-best-practices -g -a gemini-cli -y`

## Description

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.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# FLUX Best Practices

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

> **Extended reference:** [`AGENTS.md`](AGENTS.md) in this directory is the long-form upstream FLUX guide (vendored from Black Forest Labs). It is supplementary reference material scoped to this skill only, `SKILL.md` is the loadable entry point and the authority. It does not override or extend the repository-root `AGENTS.md` / `AGENT_GUIDE.md`.

## 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 Case            | Recommended Model | Notes                                  |
| ------------------- | ----------------- | -------------------------------------- |
| Fastest generation  | FLUX.2 [klein]    | 4B or 9B, sub-second                   |
| Highest quality     | FLUX.2 [max]      | Best detail, grounding search          |
| Production balanced | FLUX.2 [pro]      | Quality + speed                        |
| Typography/text     | FLUX.2 [flex]     | Best text rendering                    |
| Local/development   | FLUX.2 [dev]      | Open weights                           |
| Image editing       | FLUX.2 [pro/max]  | Pass image URL directly to input_image |
| Inpainting          | FLUX.1 Fill       | Object removal/completion              |
| Context editing     | FLUX.1 Kontext    | Older model, prefer FLUX.2             |

### Critical Rules

The rest: https://github.com/calesthio/OpenMontage/blob/HEAD/.agents/skills/flux-best-practices/SKILL.md