ergon

name	ergon
description	AI media generation CLI tool using Google's Imagen 4, Veo 3.1, and Gemini TTS. Use when the user wants to (1) generate images from text prompts, (2) edit existing images with AI, (3) explain image contents, (4) generate videos from text or images, (5) create narration/voice audio with character settings. Triggers on requests like "generate an image of...", "create a video...", "make a voice that says...", "edit this image to...", "describe this image".
license	MIT
metadata	{"author":"hirokidaichi","version":"0.4.0"}

ergon - AI Media Generation CLI

Note: Run with npx ergon if not installed globally.

Quick Reference

npx ergon image gen "<prompt>" -t <style> -a <ratio>   # Image generation
npx ergon image edit <file> "<instruction>"            # Image editing
npx ergon video gen "<prompt>" [-i <image>]            # Video with audio
npx ergon narration gen "<text>" -c "<character>"      # Voice generation

Image Generation

npx ergon image gen [options] <theme>

Style Selection Guide

Use Case	Style (-t)	Aspect (-a)
Product photo, landscape	realistic	16:9, 4:3
Character, mascot	anime, illustration	1:1, 3:4
Icon, logo	flat, minimal	1:1
Art, poster	watercolor, oil-painting, pop-art	varies
Game asset	pixel-art, 3d-render	1:1
Business, presentation	corporate	16:9
Concept sketch	sketch	varies

Options

Option	Values	Default
-t, --type	realistic, illustration, flat, anime, watercolor, oil-painting, pixel-art, sketch, 3d-render, corporate, minimal, pop-art	flat
-a, --aspect-ratio	16:9, 4:3, 1:1, 9:16, 3:4	16:9
-s, --size	tiny, hd, fullhd, 2k, 4k	fullhd
-e, --engine	imagen4, imagen4-fast, imagen4-ultra	imagen4

Examples:

npx ergon image gen "cute cat mascot for tech startup" -t anime -a 1:1
npx ergon image gen "professional team meeting in modern office" -t corporate -a 16:9
npx ergon image gen "abstract geometric logo" -t minimal -a 1:1 -o logo.png

Image Editing

npx ergon image edit [options] <file> <prompt>

Edit instructions in natural language:

• Background change: "change background to sunset beach"
• Style transfer: "make it look like watercolor painting"
• Object removal: "remove the person on the left"
• Color adjustment: "make colors more vibrant"

npx ergon image edit photo.jpg "change background to blue sky"
npx ergon image edit portrait.png "convert to anime style"

Video Generation (with Audio)

Veo 3.1 generates videos with synchronized audio. Include audio/sound instructions directly in the prompt.

npx ergon video gen [options] <theme>

Prompt Structure for Audio-Video

Include sound descriptions in your prompt:

# Sound effects included
npx ergon video gen "cat meowing and playing with a ball, soft purring sounds"

# Music/ambient audio
npx ergon video gen "sunset timelapse over ocean, with calming wave sounds and soft piano music"

# Dialogue/voice
npx ergon video gen "person saying 'welcome to our channel' with friendly tone, waving at camera"

Image-to-Video

Animate a static image with motion and sound:

npx ergon video gen "character starts dancing to upbeat music" -i character.png
npx ergon video gen "logo reveals with whoosh sound effect" -i logo.png

Options

Option	Values	Default
-i, --input	image file	-
-d, --duration	5-8 seconds	8
-a, --aspect-ratio	16:9, 9:16	16:9
--fast	use Veo 3.1 Fast	false

Vertical video for TikTok/Reels: -a 9:16

Narration Generation

For voice-only audio without video, use narration command.

npx ergon narration gen [options] <text>

Character and Acting Direction

Use -c (character) and -d (direction) for expressive voice:

# Character defines WHO is speaking
npx ergon narration gen "Let's go on an adventure!" -c "energetic young girl"

# Direction defines HOW they speak
npx ergon narration gen "The results are in..." -c "news anchor" -d "serious, building suspense"

# Combined for full expression
npx ergon narration gen "Yay! We did it!" -c "excited child" -d "jumping with joy, high energy"

Voice Selection

Voice	Character
Kore	Female, versatile (default)
Aoede	Female, warm
Charon	Male, deep
Fenrir	Male, strong
Puck	Neutral, playful

Options

Option	Values	Default
-v, --voice	Kore, Aoede, Charon, Fenrir, Puck	Kore
-c, --character	character description	-
-d, --direction	acting direction	-
--speed	0.25-4.0	1.0
-l, --lang	ja, en, zh, ko, etc.	ja

Workflow Patterns

Generate, then Edit

npx ergon image gen "product photo of headphones" -t realistic
npx ergon image edit headphones.png "add soft shadow, white background"

Image to Animated Video

npx ergon image gen "mascot character standing" -t anime -a 1:1
npx ergon video gen "mascot waves and says hello cheerfully" -i mascot.png

Preview Before Generation

npx ergon image gen "complex scene" --dry-run  # Check settings
npx ergon video gen "expensive render" --dry-run  # Verify before API call

Common Options

All commands support:

• --json - JSON output for scripting
• --dry-run - Preview settings without API call
• -o, --output <path> - Specify output path