pixelfix

Command line tool to change transparent pixels in images to use the nearest color instead of black

Modern fork of Transparent-Pixel-Fix with some optimizations (bun, sharp). A rewrite is planned in something lower level, like Rust

Comparison

Old pixelfix (jimp) takes 2.556s to process sample.png

My pixelfix (sharp) takes 0.810s to process sample.png

Both have exactly the same output. I did a pretty rough comparison by just doing time in bash before the exe path for both of them and held down enter lmfao

Usage

Grab the latest release or build/run manually:

bun install
bun index.js

To package for all platforms:

# Windows
bun build --compile --minify --sourcemap --target=bun-windows-x64 index.js --outfile bin/pixelfix-windows.exe

# Linux
bun build --compile --minify --sourcemap --target=bun-linux-x64 index.js --outfile bin/pixelfix-linux

# macOS
bun build --compile --minify --sourcemap --target=bun-darwin-arm64 index.js --outfile bin/pixelfix-macos

# macOS Intel
bun build --compile --minify --sourcemap --target=bun-darwin-x64 index.js --outfile bin/pixelfix-macos-intel

you will download 100mb exe from releases and you will enjoy it

More info

When saving an image file, most image editors will save completely transparent pixels as black. On some platforms, the resizing algorithm blends transparent pixels with non-transparent pixels, resulting in black edges on resized images. Here is an article showing the difference and discussing techniques to fix the issue.

This script keeps those pixels transparent, but changes their color to match the nearest non-transparent pixel. This means that when the non-transparent and transparent pixels are blended, there should be no color difference.

An image with and without pixelfix applied:

source