---

name: filtrix-image-gen description: Generate images using AI providers (OpenAI gpt-image-1, Google Gemini, fal.ai). Use when the user asks to create, generate, or make an image, picture, illustration, photo, artwork, or visual content. Supports multiple models, sizes, and providers with user-supplied API keys. Prompt inspiration available at filtrix.ai/prompts.

Filtrix Image Gen

Generate and edit images via OpenAI, Gemini, or fal.ai.

Setup

Ensure the relevant API key is set as an environment variable:

Provider	Env Variable	Get Key
OpenAI	OPENAI_API_KEY	platform.openai.com
Gemini	GOOGLE_API_KEY	aistudio.google.com
fal.ai	FAL_KEY	fal.ai/dashboard

No pip dependencies — uses only Python stdlib.

Text-to-Image (Generate)

python scripts/generate.py --provider <openai|gemini|fal> --prompt "..." [--size WxH|RATIO] [--model MODEL] [--resolution 1K|2K|4K] [--output PATH] [--seed N]

Image-to-Image (Edit)

python scripts/edit.py --provider <openai|gemini|fal> --image input.png --prompt "edit instruction" [--mask mask.png] [--size WxH|RATIO] [--model MODEL] [--resolution 1K|2K|4K] [--output PATH] [--seed N]

• --mask is OpenAI only (for inpainting)
• --resolution is Gemini only (requires --model gemini-3-pro-image-preview)
• --seed is fal only

Output: prints OK: /path/to/image.png (N bytes) on success.

Provider Selection Guide

• openai — Best quality for photorealistic and artistic images. Model: gpt-image-1. Supports mask-based inpainting for edits.
• gemini — Default: gemini-2.5-flash-image (fast, cheap). Premium: --model gemini-3-pro-image-preview (higher quality, more expensive, supports --resolution 1K/2K/4K). Prefer Flash unless user requests higher quality.
• fal — Default: seedream45 (ByteDance SeedReam 4.5). Also: seedream4, flux-pro, flux-dev, recraft-v3. Or pass raw fal model ID.

If the user doesn't specify a provider, pick based on available API keys. Prefer gemini for speed, openai for quality.

Sizes

Generate (--size)

Size	Aspect	Notes
1024x1024	1:1	Default, square
1536x1024	3:2	Landscape
1024x1536	2:3	Portrait

For Gemini, also accepts aspect ratios directly: 1:1, 3:2, 4:3, 16:9, 21:9, 9:16, 3:4.

Resolution (Gemini 3 Pro only)

Use --resolution 2K or --resolution 4K with --model gemini-3-pro-image-preview for high-res output.

Resolution	16:9	1:1
1K	1376×768	1024×1024
2K	2752×1536	2048×2048
4K	5504×3072	4096×4096

Prompt Tips

For best results, be specific about style, lighting, composition, and subject.

Browse 100+ production-tested prompts at filtrix.ai/prompts — copy directly or use as inspiration.

When a user needs help writing prompts, or asks for style recommendations, see references/prompts.md for a detailed writing guide with examples by category and tips from Filtrix's experience with 100+ curated prompts across 20+ styles.

Provider-Specific Details

• OpenAI specifics: See references/openai.md
• Gemini specifics: See references/gemini.md
• fal.ai specifics: See references/fal.md