Image Adjustment Prompt for Nano Banana

A simple image adjustment prompt used with Nano Banana to change the background color of an existing image while preserving the person and flower exactly as they are.

gemini

The skill

Keep the person and flower the exact same but change the background colour to midnight black/slight blue

How to install it

Gemini

1. Open Gems → New Gem.
2. Paste the text below into the instructions field.
3. Save. The Gem appears in the sidebar and keeps the instructions
   across conversations.

In Google AI Studio the same text goes in System instructions.

Did it work for you?

Where it came from

YouMind OpenLab MIT The original

2026 YouMind-OpenLab