Generate and edit images using Google's Nano Banana 2 (Gemini 3.1 Flash Image Preview) API. This skill should be used when the user asks to create or modify images, especially when they need fast iteration, explicit aspect-ratio control, or resolution control from 512px to 4K.

Nano Banana 2 Image Generation & Editing Generate new images or edit existing images with Nano Banana 2 ( gemini 3.1 flash image preview ). Usage Run the script using absolute or workspace relative path (do NOT cd into the skill directory first): Generate new image: Edit image(s) with references: Always run from the user's current working directory so outputs are saved in the active project context. Model Use model code: gemini 3.1 flash image preview (Nano Banana 2) Do not use gemini 3 pro image preview in this skill. Resolution Options Nano Banana 2 supports: 512px (fastest, low latency iteration) 1K (default) 2K 4K Map common user language: "quick draft", "thumbnail", "tiny", "512", "0.5K" → 512px no resolution mention → 1K "2K", "medium", "normal" → 2K "4K", "high res", "ultra", "print quality" → 4K Use uppercase K for 1K , 2K , 4K . Aspect Ratios Supported aspect ratios: 1:1 , 1:4 , 1:8 , 2:3 , 3:2 , 3:4 , 4:1 , 4:3 , 4:5 , 5:4 , 8:1 , 9:16 , 16:9 , 21:9 Map common requests: square post / icon → 1:1 phone wallpaper / vertical reel → 9:16 widescreen / slide / hero image → 16:9 cinematic wide → 21:9 portrait print → 2:3 or 3:4 panorama banner → 4:1 or 8:1 If unspecified, let the model default behavior apply. Reference Images (New in Gemini 3 Image workflows) Provide up to 14 reference images when needed by repeating input image : preserve character consistency preserve object fidelity combine multiple visual references into one output Use one image for simple edits; use multiple images for composition or consistency sensitive tasks. API Key Resolve API key in this order: 1. api key argument 2. GEMINI API KEY environment variable If no key is available, stop and report a clear error. Filename Generation Generate filenames as: yyyy mm dd hh mm ss name.png Examples: 2026 02 26 17 31 04 japanese garden.png 2026 02 26 17 31 59 social banner.png Prompt Handling For generation, pass the user's request as is unless critically underspecified. For editing, include explicit transformation instructions in the prompt and preserve the original intent. Output Save PNG to the current directory (or to a provided path in filename ) Return the full saved path(s) Do not read the output image back unless explicitly requested Examples Create a 4K widescreen image: Edit with multiple references:

nano-banana-2