rustychroma

A high-performance key background removal and edge erosion for Rust, C, C++, and WebAssembly. It is a port of chromakey.

Installation

There are 3 options:

1. crates.io: https://crates.io/crates/rustychroma
2. npm: https://www.npmjs.com/package/rustychroma
3. Direct: https://github.com/t7ru/rustychroma/releases

Usage

Rust:

use rustychroma::remove;

fn main() {
	// 1080p RGBA buffer [1]
	let mut pixels = vec![0u8; 1920 * 1080 * 4]; 
	
	// Remove green with a threshold of 7000.0 [2]
	remove(&mut pixels, 0, 255, 0, 7000.0);
}

Do note that multi-threading is disabled by default, to enable:

[dependencies]
rustychroma = { version = "0.1", features = ["parallel"] }

C:

#include "rustychroma.h"

int main() {
	// [1]
	uintptr_t len = 1920 * 1080 * 4;
	uint8_t* pixels = malloc(len);
	
	// [2]
	chromakey_remove(pixels, len, 0, 255, 0, 7000.0);
	
	free(pixels);
	return 0;
}

WebAssembly:

import init, { remove } from './dist/web/rustychroma.js';

async function run() {
	await init();
	
	// [1]
	const pixels = new Uint8Array(1920 * 1080 * 4);
	// [2]
	remove(pixels, 0, 255, 0, 7000.0);
}

Functions

• remove(): Removes pixels within the given BT.601 chroma distance of the key color. Optional multi-threading via parallel.
• remove_range(): Soft chroma key using BT.601 chroma distance. Pixels within min_threshold become fully transparent, pixels beyond max_threshold are kept, and pixels in between receive proportional transparency and color spill suppression.
• erode(): Removes exactly 1 pixel of alpha along all edges by clearing any opaque pixel adjacent to a fully transparent pixel.