Guides

Write-ups from building and using BGPeel, based on our own tests. Every image and number in them comes from real AI images run through BGPeel.

Getting started

• Turn a magenta or chroma key background into a transparent PNGBasic use of BGPeel with real before-and-after examples.
• Features and fine-tuning guideWhat every setting means, with defaults.
• Resize imagesChange size and format while keeping the background.
• Remove the Nano Banana watermarkWhy the corner sparkle mark comes off with the background.

Photo conversion and file size

• Convert HEIC to JPGiPhone photos in bulk, no upload. Times and sizes measured on real photos.
• Reduce image file sizeWhich of size, quality and format matters most. A 2.4MB photo down to 320KB.

Making images with AI

• Solid background prompts for AI image toolsWording that works and wording that fails in Nano Banana, GPT Image and Midjourney.
• Magenta vs green vs blue background testThe same characters removed from three background colors. Outlines mattered as much as color.

How it works

• Why color fringes appear and how to remove themDeleting a color versus subtracting the mixed-in background.
• AI vs color-based background removalStrengths and limits of each, and when to use which.
• PNG vs WebP vs JPG measured file sizesWebP wasn't always smaller; 256-color PNG cut size by 64–81%.

By use

• KakaoTalk emoticon sizes and transparent PNGs360px transparent PNGs, outlines on dark chat themes, margins.
• App icon and favicon sizesiOS's no-alpha rule, Android safe zones, web icon sizes.
• AI sprites to Unity and Godot sprite sheetsMatching position and scale, a packing script, engine import settings.

Troubleshooting

• Parts of the object disappearCauses by the shape of the damage, with settings. A 55% loss cut to 1.35%.
• A shadow is left behindWhich shadows remain and why, tested by strength and color.
• Gradient backgroundsFive gradient types tested, and the order to fix them in.

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