Potrace

A "1:1 output" JavaScript port of Potrace JS for NodeJS.

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Original image	Potrace output

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Online Demo

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Why did I create this package ❓

The issue

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Prerequisites

• Node.js v10+

Installation

npm install oslllo-potrace

Basic Usage

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Taken from Example.js

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Example 1

const path = require("path");
const Potrace = require("..");
const fs = require("fs-extra");
const Svg2 = require("oslllo-svg2");

async function example1() {
    var source = path.resolve("example/tree.jpg");
    var destination = path.resolve("example/tree.svg");
    var traced = await Potrace(source).trace();
    fs.writeFileSync(destination, traced);
    await Svg2(traced).png().extend(10).toFile("example/tree.png");
}

example1().then(() => {
    console.log("done");
}).catch((err) => {
    throw err;
});

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Example 2

const path = require("path");
const Potrace = require("..");
const fs = require("fs-extra");
const Svg2 = require("oslllo-svg2");

async function example2() {
    var source = path.resolve("example/tree.jpg");
    var destination = path.resolve("example/tree.svg");
    var instance = Potrace(source);
    var traced = await instance.trace();
    fs.writeFileSync(destination, traced);
    await Svg2(traced).png().extend(10).toFile("example/tree.png");
}

example2().then(() => {
    console.log("done");
}).catch((err) => {
    throw err;
});

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Parameters

• source (String | Buffer): path to image to trace.
• options (Object): option parameter object.
  • turnpolicy (string): how to resolve ambiguities in path decomposition. available options are [ Potrace.TURNPOLICY_BLACK, Potrace.TURNPOLICY_WHITE, Potrace.TURNPOLICY_LEFT, Potrace.TURNPOLICY_RIGHT, Potrace.TURNPOLICY_MINORITY, Potrace.TURNPOLICY_MAJORITY ] (default: Potrace.TURNPOLICY_MINORITY).
  • turdsize: (Number) suppress speckles of up to this size (default: 2).
  • optcurve: (Boolean) turn on/off curve optimization (default: true).
  • alphamax: (Number) corner threshold parameter (default: 1).
  • opttolerance: (Number) curve optimization tolerance (default: 0.2).
  • svgSize: (Number) set svg output size. NOTE: The resulting image size = the original image size * size (default: 1).
  • opt_type: (String) output svg type, available options are [curve]

Changelog

Please see CHANGELOG for more information what has changed recently.

Test

npm test

Credits

Potrace JS Port by @kilobtye.

Original Potrace by Peter Selinger.

Another Potrace Port For Node.js maintained by @tooolbox.

License

The GNU General Public License v2.0 (GPL-2.0). Please see License File for more information.