edit-image

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This skill should be used when the user asks to "edit an image", "modify a photo", "inpaint", "outpaint", "extend an image", "replace object in image", "add element to image", "resize image for social media", "crop image", "adapt image for Twitter", "convert image to OG format", or needs AI-powered image editing with masks.

1installs

Sourceb-open-io/gemskills

Added on2026-03-10

NPX Install

npx skill4agent add b-open-io/gemskills edit-image

SKILL.md Content

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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

bash

bun run ${CLAUDE_PLUGIN_ROOT}/skills/edit-image/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

bash

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

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

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

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

# Replace object with multiple variations
bun run ${CLAUDE_PLUGIN_ROOT}/skills/edit-image/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.