Background Modification Prompts: Nano Banana Guide

A great expression can be ruined by a messy room, a distracting crowd, or bad lighting. Nano Banana allows you to keep the subject exactly as they are (or slightly enhanced) while completely replacing the environment, giving you total control over the context of your image.

Understanding Background Control

The secret to a believable background swap isn't just the new image; it's the integration. The lighting on the subject must match the lighting of the new background. If you put a person lit by a blue computer screen into a warm sunset beach, it will look fake. Nano Banana handles this lighting adaptation automatically if prompted correctly.

OFFICE UPGRADE

Let's start with the foundation example from the Professional Content overview. Here is the complete, fully detailed prompt to generate the "OFFICE UPGRADE".

[Subject Image] Replace the messy home background with a professional office.

Preserve:
- Subject's face, hair, and clothing
- Camera angle and perspective

Transform Background:
- **Setting**: Modern open-plan corporate office
- **Details**: Glass walls, blurred workstations, architectural lighting
- **Depth**: Shallow depth of field (bokeh) to focus on subject
- **Lighting**: Cool, clean office daylight (5000K)

Integration:
- **Relight Subject**: Subtly adjust subject lighting to match the new cool office environment
- **Shadows**: Cast natural shadows from the subject onto the environment
- **Edges**: Clean, natural hair masking

Why This Works

The "Shallow Depth of Field": Asking for "bokeh" or "shallow depth of field" is the single best way to hide the fact that a background is fake. By blurring the background, you remove sharp details that might clash with the subject's resolution or perspective.

The "Glass Walls": Glass walls and architectural elements imply a high-end, spacious environment without needing specific furniture that might look cluttered.

The Lighting Match: Explicitly asking to "relight subject" ensures that the color temperature (cool office light vs. warm home light) is corrected, making the subject look like they are actually there.

Common Mistakes

Variations on "OFFICE UPGRADE"

Change the setting to suit different professional needs.

The Studio Backdrop

Create a clean, distraction-free look.

[Subject Image] Change background to a professional studio backdrop.

- **Type**: Hand-painted canvas texture
- **Color**: Neutral beige or mottled grey
- **Lighting**: Soft studio lighting
- **Vibe**: High-end portrait photography
- **Focus**: Sharp subject, soft background texture

What Changed: We removed the "office" entirely and replaced it with a "canvas texture," focusing purely on the subject.

The Outdoor Park

For a friendlier, more natural vibe.

[Subject Image] Move subject to an outdoor park setting.

- **Setting**: Lush green trees and sunlight filtering through leaves
- **Lighting**: Golden hour (warm, backlighting)
- **Effect**: Sun flare / lens flare
- **Vibe**: Natural, approachable, eco-friendly

What Changed: We introduced "golden hour" lighting, which requires the AI to add warm rim lighting to the subject to make it believable.

Expanding Your Context

Place your subject in specific locations to tell a story.

The Coffee Shop Ambience

The "digital nomad" or creative professional look.

[Subject Image] Place subject in a trendy coffee shop.

- **Background**: Brick walls, warm hanging lights, blurred espresso machine
- **Lighting**: Warm, cozy interior lighting
- **Depth**: Subject in focus, busy shop blurred behind
- **Vibe**: Creative, relaxed, modern

The Conference Stage

Position the subject as a thought leader.

[Subject Image] Place subject on a conference stage.

- **Background**: Dark auditorium with stage lights and blurred audience
- **Lighting**: Strong spotlight on subject, rim light from back
- **Vibe**: Keynote speaker, authority, leadership
- **Context**: Holding a microphone (optional, if hands visible)

Troubleshooting

Next Steps

• Outfit & Lighting: Fix the clothes to match the new office.
• Travel & Location: Move to vacation spots instead of offices.