Nano Banana Poster Generator First time? If above, run first, then set . Generate images using Google's Gemini model with optional reference assets. Quick Start Aspect Ratio IMPORTANT: Always use the default 3:2 aspect ratio unless the user explicitly requests a different format (like "vertical", "story", "square", etc.). Do NOT change the aspect ratio on your own. Control image dimensions with or : | Ratio | Use Case | |-------|----------| | | Horizontal (DEFAULT - use this unless user specifies otherwise) | | | Square - Instagram, profile pics | | | Vertical - Pinterest, posters | | | Wide…