Edit Image

Edit images using Nano Banana Pro (gemini-3-pro-image-preview).

When to Use

Use this skill when the user asks to:

• Edit part of an image (inpainting)
• Extend an image beyond its borders (outpainting)
• Replace objects or regions in an image
• Add elements to an existing image
• Adapt an existing image for a different format or platform (social media, OG, Twitter card)

How It Works

Uses Gemini's multimodal capabilities to understand and edit images via natural language. The model takes the source image and a text prompt describing the desired edit, then generates a new image with the changes applied.

Semantic masking: Instead of requiring precise pixel masks, describe what to change in your prompt. The model understands context and can target specific regions.

Optional mask images: You can still provide a mask image (white = edit area) as a visual hint, but it's not required. Descriptive prompts often work better.

Usage

cd ${CLAUDE_PLUGIN_ROOT}/skills/edit-image && bun run scripts/edit.ts <input-image> "edit prompt" [options]

Options

• --mask <path> - Optional mask image (white = edit area, black = keep)
• --mode <inpaint|outpaint> - Edit mode
• --format <png|jpeg|webp> - Output format
• --quality <n> - JPEG quality (1-100)
• --negative <prompt> - What to avoid in the edit
• --count <n> - Number of variations
• --seed <n> - Random seed
• --output <path> - Output path

Examples

# Simple edit with descriptive prompt (no mask needed)
cd ${CLAUDE_PLUGIN_ROOT}/skills/edit-image && bun run scripts/edit.ts photo.jpg "change the background to a beach sunset"

# Edit with mask for precise control
cd ${CLAUDE_PLUGIN_ROOT}/skills/edit-image && bun run scripts/edit.ts photo.jpg "add a sunset sky" --mask sky_mask.png --mode inpaint

# Outpaint to extend image
cd ${CLAUDE_PLUGIN_ROOT}/skills/edit-image && bun run scripts/edit.ts photo.jpg "extend the landscape" --mode outpaint

# Edit with negative prompt
cd ${CLAUDE_PLUGIN_ROOT}/skills/edit-image && bun run scripts/edit.ts portrait.png "fix the teeth to look natural" --negative "gap in teeth, missing teeth"

# Replace object with multiple variations
cd ${CLAUDE_PLUGIN_ROOT}/skills/edit-image && bun run scripts/edit.ts scene.jpg "replace the car with a bicycle" --count 3

Context Discipline

Do not read generated images back into context. The script outputs only the file path. Ask the user to visually inspect the result. To inspect programmatically, optimize the image first (via the optimize-images skill) to avoid filling the context window with large uncompressed image data.

Prompt Tips

• Be specific: "Change only the sky to golden hour lighting" works better than "make it look better"
• Describe preservation: The tool automatically adds "keep everything else the same" but you can be more specific
• Use negative prompts: --negative "blurry, distorted" helps avoid unwanted artifacts
• Iterate: Generate a few variations with --count 2 and pick the best one

Model

Uses gemini-3-pro-image-preview - Nano Banana Pro, Google's professional image generation and editing model. No Vertex AI credentials required.

Last verified: February 2026. If a newer generation exists, STOP and suggest a PR to b-open-io/gemskills. See the ask-gemini skill's references/gemini-api.md for current models and Google's official gemini-api-dev skill for the canonical source.