Image Generation
Generate images using Google Gemini (gemini-3-pro-image-preview) for both text-to-image and image-to-image workflows.
Use the packaged CLI:
middleman image generate \
--prompt "a cute robot bee in a garden" \
--output "/path/to/output.png"
Image-to-image generation is supported with repeated --input-image flags:
middleman image generate \
--prompt "turn this sketch into a painted poster with a limited teal and coral palette" \
--input-image "/path/to/sketch.png" \
--input-image "/path/to/reference.jpg" \
--output "/path/to/output.png"
Options
--prompt(required): text description of the image to generate--output(required): output file path (extension auto-detected when omitted)--input-image(optional, repeatable): local source image(s) to send alongside the prompt--aspect-ratio(optional): aspect ratio like16:9,1:1,4:3--size(optional): image size, default1K
Output
The script prints JSON:
- Success:
{ "ok": true, "file": "/path/to/output.png", "mimeType": "image/png" } - Failure:
{ "ok": false, "error": "..." }
Source: SawyerHood/middleman — distributed by TomeVault.