vtracer

VTracer: Python Binding

Raster to Vector Graphics Converter built on top of visioncortex

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_{Built with 🦀 by The Vision Cortex Research Group}

Introduction

visioncortex VTracer is an open source software to convert raster images (like jpg & png) into vector graphics (svg). It can vectorize graphics and photographs and trace the curves to output compact vector files.

Comparing to Potrace which only accept binarized inputs (Black & White pixmap), VTracer has an image processing pipeline which can handle colored high resolution scans.

Comparing to Adobe Illustrator's Image Trace, VTracer's output is much more compact (less shapes) as we adopt a stacking strategy and avoid producing shapes with holes.

VTracer is originally designed for processing high resolution scans of historic blueprints up to gigapixels. At the same time, VTracer can also handle low resolution pixel art, simulating image-rendering: pixelated for retro game artworks.

A technical description of the algorithm is on visioncortex.org/vtracer-docs.

Install (Python)

pip install vtracer

Usage (Python)

import vtracer

input_path = "/path/to/some_file.jpg"
output_path = "/path/to/some_file.vtracer.jpg"

# Minimal example: use all default values, generate a multicolor SVG
vtracer.convert_image_to_svg_py(inp, out)

# Single-color example. Good for line art, and much faster than full color:
vtracer.convert_image_to_svg_py(inp, out, colormode='binary')

# Convert from raw image bytes
input_img_bytes: bytes = get_bytes() # e.g. reading bytes from a file or a HTTP request body
svg_str: str = vtracer.convert_raw_image_to_svg(input_img_bytes, img_format = 'jpg')

# Convert from RGBA image pixels
from PIL import Image
img = Image.open(input_path).convert('RGBA')
pixels: list[tuple[int, int, int, int]] = list(img.getdata())
svg_str: str = vtracer.convert_pixels_to_svg(pixels)

# All the bells & whistles, also applicable to convert_raw_image_to_svg and convert_pixels_to_svg. 
vtracer.convert_image_to_svg_py(inp,
                                out,
                                colormode = 'color',        # ["color"] or "binary"
                                hierarchical = 'stacked',   # ["stacked"] or "cutout"
                                mode = 'spline',            # ["spline"] "polygon", or "none"
                                filter_speckle = 4,         # default: 4
                                color_precision = 6,        # default: 6
                                layer_difference = 16,      # default: 16
                                corner_threshold = 60,      # default: 60
                                length_threshold = 4.0,     # in [3.5, 10] default: 4.0
                                max_iterations = 10,        # default: 10
                                splice_threshold = 45,      # default: 45
                                path_precision = 3          # default: 8
                                )

Rust Library

The (Rust) library can be found on crates.io/vtracer and crates.io/vtracer-webapp.