image-generation

Image Generation

Generate images using Google's Gemini model (default) or fal.ai FLUX.2 klein 4B (cheap mode).

Quick Start

MANDATORY: Always use -d (destination) flag to specify output path. This avoids file management issues with poster_0.jpg in the scripts folder.

cd ~/.claude/skills/image-generation/scripts

# ALWAYS specify destination with -d flag
npx tsx generate_poster.ts -d /tmp/my-image.jpg "A futuristic city at sunset"

# Cheap mode: fal.ai FLUX.2 klein 4B (fast, lower cost)
npx tsx generate_poster.ts --cheap -d /tmp/city.jpg "A futuristic city at sunset"

# With aspect ratio
npx tsx generate_poster.ts -d /tmp/landscape.jpg --aspect 3:2 "A wide landscape poster"
npx tsx generate_poster.ts --cheap -d /tmp/story.jpg -a 9:16 "A vertical story format"

# With reference assets (image editing)
npx tsx generate_poster.ts -d /tmp/banner.jpg --assets "/path/to/avatar.jpg" "Create banner with character"
npx tsx generate_poster.ts --cheap -d /tmp/photo.jpg --assets "/path/to/image.jpg" "Turn this into a realistic photo"

Why -d is mandatory:

• Output goes to predictable location (e.g., /tmp/ for temp images)
• Avoids hunting for poster_0.jpg in scripts folder
• Enables immediate use without file renaming

Providers

Provider	Flag	Use Case	Cost
Gemini	(default)	High quality, best results	Higher
fal.ai klein 4B	--cheap	Fast, budget-friendly	~$0.003/image

Cheap Mode (--cheap)

Uses fal.ai FLUX.2 klein 4B - a distilled FLUX model optimized for speed and cost.

Why use cheap mode?

• Cost: ~$0.003 per image (vs Gemini's higher cost)
• Speed: Fast 4-step inference (~2-4 seconds)
• Quality: Good enough for drafts, social media, iterations
• Batch friendly: Generate many variations quickly

Endpoints:

• Text-to-image: fal-ai/flux-2/klein/4b
• Image editing (with --assets): fal-ai/flux-2/klein/4b/edit

Best for:

• Quick iterations and previews
• Social media content
• Concept exploration
• Batch generation (10+ images)

Use Gemini instead for:

• Final production assets
• Complex compositions
• Text-heavy images (especially Hebrew)

Quality

Control image resolution with --quality or -q:

Quality	Resolution	Use Case
1K	1024px	Default - fast, good for web
2K	2048px	High quality - print, detailed posters

npx tsx generate_poster.ts -q 2K "High quality poster"

Aspect Ratio

IMPORTANT: Always use the default 3:2 aspect ratio unless the user explicitly requests a different format (like "vertical", "story", "square", etc.). Do NOT change the aspect ratio on your own.

Control image dimensions with --aspect or -a:

Ratio	Use Case
3:2	Horizontal (DEFAULT - use this unless user specifies otherwise)
1:1	Square - Instagram, profile pics
2:3	Vertical - Pinterest, posters
16:9	Wide - YouTube thumbnails, headers
9:16	Tall - Stories, reels, TikTok

npx tsx generate_poster.ts --aspect 3:2 "Your prompt"
npx tsx generate_poster.ts -a 16:9 "Your prompt"

Adding Assets (Reference Images)

Use --assets with full paths to include reference images:

# Single asset
npx tsx generate_poster.ts --assets "/full/path/to/image.jpg" "Your prompt"

# Multiple assets (comma-separated)
npx tsx generate_poster.ts --assets "/path/a.jpg,/path/b.png" "Use both images"

# With cheap mode - uses fal.ai edit endpoint
npx tsx generate_poster.ts --cheap --assets "/path/to/image.jpg" "Turn this into a painting"

Supported formats: .jpg, .jpeg, .png, .webp, .gif

IMPORTANT: Assets are NOT automatically included. You must explicitly pass them via --assets.

Destination (MANDATORY)

ALWAYS use --destination or -d to specify output path:

# REQUIRED: Always specify destination
npx tsx generate_poster.ts -d /tmp/poster.jpg "My poster"

# If file exists, auto-adds suffix: poster_1.jpg, poster_2.jpg, etc.

Features:

• Auto-creates parent directories if needed
• Collision avoidance: if file exists, adds _1, _2, etc.
• Use /tmp/ for temporary images that will be uploaded elsewhere

API Configuration

Create scripts/.env:

GEMINI_API_KEY=your_gemini_api_key
FAL_KEY=your_fal_api_key
XAI_API_KEY=your_xai_api_key

Hebrew/RTL Content

IMPORTANT: When the image contains Hebrew text, you MUST add the following sentence to the prompt:

"CRITICAL: Layout is RTL (right-to-left). All text in Hebrew. Visual flow, reading order, and panel sequence go from RIGHT to LEFT."

Copy this exact sentence and paste it at the BEGINNING of your prompt. Without it, the image will render left-to-right which is wrong for Hebrew content.

WOW Mode

When user asks for "wow mode" or wants maximum visual impact, add these epic elements to the prompt:

"EPIC CINEMATIC WOW: Amazed expression, mind-blown reaction, intense VFX - shattered glass particles, explosive energy bursts, volumetric light rays, dramatic lens flares, particle explosions, motion blur streaks, holographic glitches, electric sparks, cinematic color grading, dramatic rim lighting, depth of field bokeh, anamorphic lens effects. Maximum visual spectacle."

Output

• Files saved to path specified by -d flag (MANDATORY)
• Aspect ratio: Configurable via --aspect (default: 3:2)
• Quality: 1K (1024px on longest edge)

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Video Generation

Generate videos using xAI Grok Imagine Video (default) or fal.ai LTX-2 (cheap mode).

Quick Start

cd ~/.claude/skills/image-generation/scripts

# Text-to-video (Grok Imagine - high quality, 720p)
npx tsx generate_video.ts -d /tmp/video.mp4 "A futuristic city at sunset, cinematic drone shot"

# Cheap mode: fal.ai LTX-2 (fast, low cost)
npx tsx generate_video.ts --cheap -d /tmp/video.mp4 "A futuristic city at sunset"

# Image-to-video (animate a still image)
npx tsx generate_video.ts -d /tmp/animated.mp4 --image /path/to/image.jpg "Slow zoom with particles floating"
npx tsx generate_video.ts --cheap -d /tmp/animated.mp4 --image /path/to/image.jpg "Gentle camera movement"

# Custom duration and aspect ratio
npx tsx generate_video.ts -d /tmp/long.mp4 -t 10 -a 9:16 "Vertical video for stories"

Video Providers

Provider	Flag	Quality	Duration	Resolution	Cost
Grok Imagine	(default)	High, cinematic	1-15s	480p/720p	Per-second billing
fal.ai LTX-2	--cheap	Good, fast	1-10s	~480p	Budget-friendly

Video Options

Option	Flag	Default	Description
Prompt	(positional)	required	Text description of the video
Destination	-d	required	Output file path (.mp4)
Duration	-t	5	Duration in seconds
Aspect ratio	-a	16:9	16:9, 9:16, 1:1, 4:3, 3:4, 3:2, 2:3
Resolution	-r	720p	480p or 720p (Grok only)
Image source	--image	none	Source image for image-to-video
Cheap mode	--cheap	false	Use LTX-2 instead of Grok