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generate-image

Generate or edit images using AI models (FLUX, Nano Banana 2). Use for general-purpose image generation including photos, illustrations, artwork, visual assets, concept art, and any image that is not a technical diagram or schematic. For flowcharts, circuits, pathways, and technical diagrams, use the scientific-schematics skill instead.

Author

@K-Dense-AI

Category

Image Processing

Install

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Download and install this skill https://openskills.cc/api/download?slug=k-dense-ai-skills-generate-image&locale=en&source=copy
name:generate-imagedescription:Generate or edit images using AI models (FLUX, Nano Banana 2). Use for general-purpose image generation including photos, illustrations, artwork, visual assets, concept art, and any image that is not a technical diagram or schematic. For flowcharts, circuits, pathways, and technical diagrams, use the scientific-schematics skill instead.license:MIT licensecompatibility:Requires an OpenRouter API keymetadata:[object Object]

Generate Image

Generate and edit high-quality images using OpenRouter's image generation models including FLUX.2 Pro and Gemini 3.1 Flash Image Preview.

When to Use This Skill

Use generate-image for:

  • Photos and photorealistic images

  • Artistic illustrations and artwork

  • Concept art and visual concepts

  • Visual assets for presentations or documents

  • Image editing and modifications

  • Any general-purpose image generation needs

    • Use scientific-schematics instead for:

  • Flowcharts and process diagrams

  • Circuit diagrams and electrical schematics

  • Biological pathways and signaling cascades

  • System architecture diagrams

  • CONSORT diagrams and methodology flowcharts

  • Any technical/schematic diagrams

    • Quick Start

    Use the scripts/generate_image.py script to generate or edit images:

    # Generate a new image
python scripts/generate_image.py "A beautiful sunset over mountains"

# Edit an existing image
python scripts/generate_image.py "Make the sky purple" --input photo.jpg

    This generates/edits an image and saves it as generated_image.png in the current directory.

    API Key Setup

    CRITICAL: The script requires an OpenRouter API key. Before running, check if the user has configured their API key:

  • Look for a .env file in the project directory or parent directories

  • Check for OPENROUTER_API_KEY=<key> in the .env file

  • If not found, inform the user they need to:

    • - Create a .env file with OPENROUTER_API_KEY=your-api-key-here
    - Or set the environment variable: export OPENROUTER_API_KEY=your-api-key-here
    - Get an API key from: https://openrouter.ai/keys

    The script will automatically detect the .env file and provide clear error messages if the API key is missing.

    Model Selection

    Default model: google/gemini-3.1-flash-image-preview (high quality, recommended)

    Available models for generation and editing:

  • google/gemini-3.1-flash-image-preview - High quality, supports generation + editing

  • black-forest-labs/flux.2-pro - Fast, high quality, supports generation + editing

    • Generation only:

  • black-forest-labs/flux.2-flex - Fast and cheap, but not as high quality as pro

    • Select based on:

  • Quality: Use gemini-3.1-flash-image-preview or flux.2-pro

  • Editing: Use gemini-3.1-flash-image-preview or flux.2-pro (both support image editing)

  • Cost: Use flux.2-flex for generation only

    • Common Usage Patterns

    Basic generation


    python scripts/generate_image.py "Your prompt here"

    Specify model


    python scripts/generate_image.py "A cat in space" --model "black-forest-labs/flux.2-pro"

    Custom output path


    python scripts/generate_image.py "Abstract art" --output artwork.png

    Edit an existing image


    python scripts/generate_image.py "Make the background blue" --input photo.jpg

    Edit with a specific model


    python scripts/generate_image.py "Add sunglasses to the person" --input portrait.png --model "black-forest-labs/flux.2-pro"

    Edit with custom output


    python scripts/generate_image.py "Remove the text from the image" --input screenshot.png --output cleaned.png

    Multiple images


    Run the script multiple times with different prompts or output paths:
    python scripts/generate_image.py "Image 1 description" --output image1.png
python scripts/generate_image.py "Image 2 description" --output image2.png

    Script Parameters

  • prompt (required): Text description of the image to generate, or editing instructions

  • --input or -i: Input image path for editing (enables edit mode)

  • --model or -m: OpenRouter model ID (default: google/gemini-3.1-flash-image-preview)

  • --output or -o: Output file path (default: generated_image.png)

  • --api-key: OpenRouter API key (overrides .env file)

    • Example Use Cases

    For Scientific Documents


    # Generate a conceptual illustration for a paper
python scripts/generate_image.py "Microscopic view of cancer cells being attacked by immunotherapy agents, scientific illustration style" --output figures/immunotherapy_concept.png

# Create a visual for a presentation
python scripts/generate_image.py "DNA double helix structure with highlighted mutation site, modern scientific visualization" --output slides/dna_mutation.png

    For Presentations and Posters


    # Title slide background
python scripts/generate_image.py "Abstract blue and white background with subtle molecular patterns, professional presentation style" --output slides/background.png

# Poster hero image
python scripts/generate_image.py "Laboratory setting with modern equipment, photorealistic, well-lit" --output poster/hero.png

    For General Visual Content


    # Website or documentation images
python scripts/generate_image.py "Professional team collaboration around a digital whiteboard, modern office" --output docs/team_collaboration.png

# Marketing materials
python scripts/generate_image.py "Futuristic AI brain concept with glowing neural networks" --output marketing/ai_concept.png

    Error Handling

    The script provides clear error messages for:

  • Missing API key (with setup instructions)

  • API errors (with status codes)

  • Unexpected response formats

  • Missing dependencies (requests library)

    • If the script fails, read the error message and address the issue before retrying.

    Notes

  • Images are returned as base64-encoded data URLs and automatically saved as PNG files

  • The script supports both images and content response formats from different OpenRouter models

  • Generation time varies by model (typically 5-30 seconds)

  • For image editing, the input image is encoded as base64 and sent to the model

  • Supported input image formats: PNG, JPEG, GIF, WebP

  • Check OpenRouter pricing for cost information: https://openrouter.ai/models

    • Image Editing Tips

  • Be specific about what changes you want (e.g., "change the sky to sunset colors" vs "edit the sky")

  • Reference specific elements in the image when possible

  • For best results, use clear and detailed editing instructions

  • Both Gemini 3.1 Flash Image Preview and FLUX.2 Pro support image editing through OpenRouter

    • Integration with Other Skills

  • scientific-schematics: Use for technical diagrams, flowcharts, circuits, pathways

  • generate-image: Use for photos, illustrations, artwork, visual concepts

  • scientific-slides: Combine with generate-image for visually rich presentations

  • latex-posters: Use generate-image for poster visuals and hero images