Nano Banana Alpha Tool

Extract perfect transparency from black & white backgrounds

Extract Perfect Transparency from Nano Banana Images

🎯 The Problem

AI background removal tools often struggle with semi-transparent objects (glass, smoke, hair), creating harsh edges or green halos. They're also inconsistent with fine details like shadows and translucent materials.

✨ The Solution: Mathematical Precision

This tool uses a mathematical approach instead of AI guessing. By comparing the same image on pure black and pure white backgrounds, it calculates exact transparency values for every pixel.

🚀 How to Use with Nano Banana / Nano Banana Pro

  1. Generate your image on white background:
    "A glass bottle with water droplets, pure white background"
  2. Generate the EXACT SAME image on black background:
    "A glass bottle with water droplets, pure black background"

    Tip: Keep the prompt identical except for the background color

  3. Drag and drop both generated images into the boxes below
  4. Click "Extract Alpha" to generate a mathematically perfect transparent PNG
  5. Download your result with preserved semi-transparency!
Why this works: Semi-transparent pixels appear different on black vs white backgrounds. The mathematical difference between these two views reveals the exact transparency and true color of each pixel.

Upload Images

Drop image here or click to browse

Drop image here or click to browse

Frequently Asked Questions

❓ Why is text a bit blurry?

The algorithm works at the pixel level, so higher resolution images produce sharper results. When generating images with Nano Banana, request 2K (2048×2048) or even 4K (4096×4096) resolution for crisp text and fine details. Higher resolution inputs dramatically improve the quality of your transparent output.

❓ Do the images need to be identical?

Yes! The same subject, angle, and composition must be identical in both images - only the background color should change (pure black vs pure white). Even small differences will create artifacts in the transparency.