Guide: Using Gemini Flash 2.5 aka Nano Banana

Understanding Gemini Flash Image

Gemini Flash 2.5 (alias nano-banana) is Google's AI tool designed for fast image generation and editing. The tool excels when you need to make targeted, specific changes and iterate quickly.

This guide covers the tool's capabilities and provides real workflow examples to help you understand how to use it effectively for various image creation and editing tasks.

What This Tool Does

Core Functions

• Text-to-Image Generation: Create new images from detailed text prompts

• Image-to-Image Editing: Modify existing photos with specific instructions

• Multi-Image Composition: Combine elements from multiple source images

• Iterative Refinement: Make small, precise adjustments efficiently

When to Use It

• Creating concept visuals, social imagery, and background assets

• Photo editing: relighting, cleanup, background swaps, object removal/addition

• Compositing: placing subjects into new environments

• Producing consistent image sets with variations

What You Should Prepare

• Reference images you have rights to use (subjects, backgrounds, textures)

• Style references like mood boards, color palette codes, or inspiration images

• Clear requirements for your output (orientation, pixel size, file type, platform specs)

• Brand or project constraints you need to maintain

Professional Prompting Framework

Basic Prompt Structure

[Subject] + [Style] + [Camera/Light] + [Palette] + [Composition] + [Must-keep / Must-avoid]

Example:

Single lipstick tube on a marble vanity — editorial product photo, 85mm shallow-depth look, soft window light from left, high-contrast red-on-neutral palette, top-down composition with 20% headroom; keep reflections realistic; no text or logos.

For Editing Tasks

Add scope words at the beginning:

Edit only the background: replace with soft gradient from #FFE6E6 to #FFFFFF; keep product and shadows unchanged.

Advanced Techniques

Surgical Local Edits

Use plain English for specific changes:

• "Remove the coffee stain from the t-shirt; leave fabric texture intact"

• "Adjust only the hair lighting; add slight rim light; do not change face geometry"

Multi-Image Fusion for Quick Compositions

Upload your subject + target environment, then:

• "Match scale, shadows, and color cast to the environment"

• "Move subject 10% left; add soft contact shadow; lower saturation -10% to blend"

Character/Brand Consistency

• "Preserve the model's face, hairstyle, and earrings; vary only the background and shirt color"

• "Keep exact label art; do not re-typeset text"

Iterative Workflow

Chain simple commands instead of complex prompts:

1. Clean background

2. Adjust lighting

3. Add specific elements

4. Fine-tune colors

Real Workflow Examples

Workflow A: Clean Marketplace Images

Goal: Professional product images with white backgrounds

Prompt:

Create a marketplace main image for the attached product.

Requirements:
- Square 2000×2000 px, 300 DPI, sRGB
- Pure white background (#FFFFFF), no horizon line, no props
- Product centered and fills 85–90% of frame
- Natural soft contact shadow; no harsh reflections
- Preserve label and proportions exactly; do not redraw text
- Export as PNG with transparent background AND as JPEG on white

Common refinements:

• "Refine the silhouette. Sharpen the product edges and keep anti-aliasing clean. Do not change the product size or color."

Workflow B: Lifestyle Composites

Goal: Place products into realistic scenes

Setup: Attach product + background image

Prompt:

Composite the product into the attached living-room image.

Rules:
- Place on the coffee table, 35% from the left edge
- Match ambient lighting and color temperature to the room
- Add soft contact shadow and subtle table reflection
- Keep product scale realistic (height ~16 cm relative to table items)
- Do not change label, logo, or bottle geometry
- Output 1080×1350 px for Instagram feed

Typical adjustments:

• "Move product 10% closer to camera; keep shadow intensity proportional"

• "Warm the overall grade slightly (+300K); reduce saturation −5%"

Workflow C: Product Variations

Goal: Create different colorways while maintaining consistency

Prompt:

Create three colorway variants of the attached product:
- Bottle: sage green #87A97C / sand #E8DDC9 / deep navy #0C1F3F
- Cap: cream #F5F1E8
- Keep material roughness and metallic highlights visible
- Preserve all label text and linework exactly
- Return a 3-up contact sheet (3000×2000 px) and individual 2000×2000 px PNGs

Workflow D: Multi-Product Arrangements

Goal: Arrange multiple products in appealing compositions

Setup: Upload 2-4 product angles

Prompt:

Create a bundle image for PDP:
- Arrange 3 SKUs in a shallow arc; center the hero SKU, others at 15° outward
- Maintain consistent perspective and scale across items
- Add one soft area light from top-left; unify shadows
- White background, 2000×2000 px; keep 8% margin all sides

Workflow E: UGC-Style Authentic Images

Goal: Create content that looks user-generated

Prompt:

Turn this product photo into a UGC-style smartphone image:
- "Shot on phone" look, arm's-length selfie angle
- Natural indoor window light; subtle motion blur at edges
- Realistic home background with mild clutter; shallow depth of field
- Slightly imperfect exposure; keep product label readable
- 1080×1920 vertical for Stories/Reels; no heavy skin smoothing or oversharpness

You can find the full SOP here. Enjoy and send me your results!

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