Midjourney prompt engineering - pokročilé techniky

# Midjourney Prompt Engineering Guide

## 🎯 Optimalizovaný Prompt

```
A breathtaking cyberpunk metropolis at night, rain-soaked streets reflecting vibrant neon signs in pink, cyan, and purple hues, towering skyscrapers with holographic advertisements floating in mid-air, flying vehicles leaving light trails through dense fog, street level showing crowds with umbrellas walking past ramen shops and tech vendors, atmospheric volumetric lighting with god rays piercing through smog, cinematic wide angle shot from elevated perspective, highly detailed architecture with pipes and cables, wet asphalt with puddles creating mirror reflections, moody and mysterious atmosphere with film noir lighting --ar 16:9 --s 750 --c 15 --q 2 --v 6.1
```

## 📊 Prompt Breakdown & Technika

### 1. Hlavní Subject (Co chceme vidět)
**"A breathtaking cyberpunk metropolis at night"**
- Začínáme silným adjektivem ("breathtaking") pro visual impact
- Jasně definovaný subject (cyberpunk metropolis)
- Time of day (at night) - kritické pro lighting

### 2. Atmospheric Elements (Nálada)
**"rain-soaked streets reflecting vibrant neon signs in pink, cyan, and purple hues"**
- Weather effect (rain) pro texture a reflections
- Specific color palette (pink, cyan, purple) - typické pro cyberpunk
- "reflecting" keyword vytváří bohatší visual efekt

### 3. Architectural Details
**"towering skyscrapers with holographic advertisements floating in mid-air"**
- Scale (towering) pro depth
- Sci-fi elementy (holographic ads)
- "floating in mid-air" přidává futuristický feeling

### 4. Motion & Life
**"flying vehicles leaving light trails through dense fog"**
- Movement (flying vehicles) pro dynamiku
- Light trails - ikonický cyberpunk element
- Fog/atmosphere pro depth a mystery

### 5. Street Level Details
**"street level showing crowds with umbrellas walking past ramen shops and tech vendors"**
- Human scale pro relatability
- Specific businesses (ramen shops) - cultural context
- Crowds s deštníky - storytelling detail

### 6. Lighting Specification
**"atmospheric volumetric lighting with god rays piercing through smog"**
- Volumetric lighting - 3D effect
- God rays - dramatický lighting
- Smog - enhance atmosphere

### 7. Camera & Composition
**"cinematic wide angle shot from elevated perspective"**
- Cinematic = movie-quality
- Wide angle = comprehensive view
- Elevated perspective = dramatic viewpoint

### 8. Quality Modifiers
**"highly detailed architecture with pipes and cables"**
- "highly detailed" = více complexity
- Specific architectural elements (pipes, cables) pro authenticity

### 9. Surface & Reflections
**"wet asphalt with puddles creating mirror reflections"**
- Surface texture (wet asphalt)
- Reflections pro visual richness

### 10. Final Mood
**"moody and mysterious atmosphere with film noir lighting"**
- Mood keywords na konec pro reinforcement
- Film noir reference = specific lighting style

## 🎛️ Midjourney Parameters Explained

### `--ar 16:9` (Aspect Ratio)
- **Účel**: Cinematic widescreen format
- **Alternativy**:
- `--ar 1:1` pro square (Instagram)
- `--ar 9:16` pro vertical (phone wallpaper)
- `--ar 21:9` pro ultra-wide cinematic

### `--s 750` (Stylize)
- **Účel**: Balance mezi artistic interpretation a prompt accuracy
- **Range**: 0-1000
- 0-250: Velmi literal, méně artistic
- 250-500: Balanced (default 100)
- 500-750: Více artistic interpretation ✓
- 750-1000: Velmi stylizované, může ignorovat prompt

### `--c 15` (Chaos)
- **Účel**: Variety v generování
- **Range**: 0-100
- 0-10: Konzistentní results
- 10-30: Mírná variace ✓
- 30-100: Vysoká variabilita, experimental

### `--q 2` (Quality)
- **Účel**: Computational effort
- **Options**:
- `--q 0.25`: Draft (rychlé, low detail)
- `--q 0.5`: Standard
- `--q 1`: Default
- `--q 2`: High quality (2x GPU time) ✓

### `--v 6.1` (Version)
- **Účel**: Použít nejnovější Midjourney model
- **Kdy použít**: Pro nejlepší quality a nejnovější features

## 🔥 Pokročilé Techniky

### Image Weights (Multi-Prompt)
```
cyberpunk city::2 neon lights::1.5 rain::1 --ar 16:9
```
- Číselné váhy určují důležitost jednotlivých částí
- Vyšší číslo = větší emphasis

### Negative Prompts (Exclude Elements)
```
... --no people, cars, daylight, bright colors
```
- Odstraní nežádoucí elementy
- Užitečné pro cleanup

### Style Reference
```
... --sref [URL obrázku]
```
- Převezme visual style z reference image
- Ideální pro konzistentní brand style

### Character Reference
```
... --cref [URL postavy] --cw 100
```
- Zachová character appearance across generací
- `--cw` (character weight) 0-100 určuje strength

## 📐 Composition Tips

### Rule of Thirds
```
"composition following rule of thirds, main subject positioned at intersection point"
```

### Leading Lines
```
"street perspective with strong leading lines converging to vanishing point"
```

### Depth Layers
```
"foreground with detailed character, midground with street vendors, background with towering buildings, creating depth of field"
```

## 🎨 Art Style Keywords (Rychlá Reference)

### Photography Styles
- "shot on Fujifilm XT4" - cinematic look
- "85mm f/1.4" - portrait bokeh
- "long exposure" - motion blur
- "golden hour lighting" - warm tones

### Artistic Styles
- "Studio Ghibli style" - anime aesthetic
- "Art Nouveau" - ornate, flowing lines
- "Brutalist architecture" - concrete, geometric
- "Vaporwave aesthetic" - retro-futuristic

### Rendering Styles
- "octane render" - 3D quality
- "unreal engine 5" - photorealistic 3D
- "watercolor painting" - traditional art
- "ink wash" - monochromatic, brushstrokes

## ⚡ Quick Prompt Formulas

### Product Photography
```
[product], clean white background, studio lighting, floating, 45 degree angle, high key lighting, commercial photography, sharp focus --ar 1:1 --q 2
```

### Character Portrait
```
[character description], dramatic side lighting, shallow depth of field, bokeh background, cinematic color grading, 85mm portrait, moody atmosphere --ar 2:3 --s 500
```

### Landscape
```
[landscape], golden hour, atmospheric perspective, foreground interest, rule of thirds, dramatic clouds, volumetric lighting, wide angle --ar 16:9 --s 400
```

### Concept Art
```
[subject], detailed matte painting, cinematic composition, epic scale, atmospheric lighting, highly detailed, concept art by [artist], trending on artstation --ar 16:9 --s 750
```

## 🚫 Common Mistakes & Fixes

### ❌ Příliš vágní
**Špatně**: "A city at night"
**Dobře**: "A cyberpunk metropolis at night with neon-lit skyscrapers, rain-soaked streets reflecting pink and cyan lights, flying cars, crowded sidewalks"

### ❌ Konfliktní keywords
**Špatně**: "photorealistic cartoon style"
**Dobře**: Vyber jeden konzistentní style

### ❌ Přemíra detailů
**Špatně**: 300 slov popisujících každý pixel
**Dobře**: 50-100 slov s klíčovými detaily, nech AI vyplnit gaps

### ❌ Ignorování parametrů
**Špatně**: Jen text bez `--ar`, `--s`, `--q`
**Dobře**: Vždy specifikuj aspect ratio a quality

## 💡 Pro Tips

1. **Začni obecně, postupně zpřesňuj**: První generace broad, pak iteruj s `--seed` pro konzistenci
2. **Používej style references**: Build si library oblíbených stylů
3. **Test různé `--s` hodnoty**: Najdi sweet spot pro svůj use case
4. **Kombinuj keywords strategicky**: Adjektivy na začátek, technické detaily uprostřed, mood na konec
5. **Studuj trending prompts**: Artstation, CGSociety pro inspiraci

## 🎓 Další Study Resources

- **Midjourney Discord**: #prompt-craft channel
- **Prompthero.com**: Community prompts s results
- **Midjourney Documentation**: docs.midjourney.com
- **Artist Study**: Hledej "in the style of [artist]" a studuj jejich techniku