Simple raster image tracer and vectorizer written in JavaScript.
Include the script:
<script src="imagetracer_v1.2.6.js"></script>Then:
// Loading an image, tracing with the 'posterized2' option preset, and appending the SVG to an element with id="svgcontainer"
ImageTracer.imageToSVG(
'panda.png', /* input filename / URL */
function(svgstr){ ImageTracer.appendSVGString( svgstr, 'svgcontainer' ); }, /* callback function to run on SVG string result */
'posterized2' /* Option preset */
);Node.js Command line interface example:
imagetracerjs/nodecli>node nodecli ../panda.png outfilename panda.svg scale 10
Expected result:
imagetracerjs/nodecli/panda.svg was saved!
- NEW: InkScape extension
- FIXED: hole shape parent search (Issues #31 #39)
- FIXED: Handle (absolute) paths in CLI correctly Issue #42
- RGBA ImageData check in colorquantization(), solving Issue #24 and #18
options.layering: default 0 = sequential, new method ; 1 = parallel, old method. (Enhancement Issue #17)- case insensitive option preset names
- README.md reorganizing
| Function name | Arguments | Returns | Run type |
|---|---|---|---|
imageToSVG |
image_url /*string*/ , callback /*function*/ , options /*optional object or preset name*/ |
Nothing, callback(svgstring) will be executed |
Asynchronous, Browser only |
imagedataToSVG |
imagedata /*object*/ , options /*optional object or preset name*/ |
svgstring /*string*/ |
Synchronous, Browser & Node.js |
imageToTracedata |
image_url /*string*/ , callback /*function*/ , options /*optional object or preset name*/ |
Nothing, callback(tracedata) will be executed |
Asynchronous, Browser only |
imagedataToTracedata |
imagedata /*object*/ , options /*optional object or preset name*/ |
tracedata /*object*/ |
Synchronous, Browser & Node.js |
imagedata is standard ImageData here, canvas is canvas .
| Function name | Arguments | Returns | Run type |
|---|---|---|---|
appendSVGString |
svgstring /*string*/, parentid /*string*/ |
Nothing, an SVG will be appended to the container DOM element with id=parentid. | Synchronous, Browser only |
loadImage |
url /*string*/, callback /*function*/ |
Nothing, loading an image from a URL, then executing callback(canvas) |
Asynchronous, Browser only |
getImgdata |
canvas /*object*/ |
imagedata /*object*/ |
Synchronous, Browser only |
imagedata is standard ImageData here, canvas is canvas .
There are more functions for advanced users, read the source if you are interested. :)
"Browser only" means that Node.js doesn't have built-in canvas and DOM support as of 2018, so loading an image to an ImageData object needs an external library.
You can use an option preset name (string) or an options object to control the tracing and rendering process.
These strings can be passed instead of the options object:
'default'
'posterized1'
'posterized2'
'posterized3'
'curvy'
'sharp'
'detailed'
'smoothed'
'grayscale'
'fixedpalette'
'randomsampling1'
'randomsampling2'
'artistic1'
'artistic2'
'artistic3'
'artistic4'
Include the script:
<script src="imagetracer_v1.2.6.js"></script>Then
// Loading smiley.png, tracing and calling alert callback on the SVG string result
ImageTracer.imageToSVG( 'smiley.png', alert );
// Almost the same with options, and the ImageTracer.appendSVGString callback will append the SVG
ImageTracer.imageToSVG( 'smiley.png', ImageTracer.appendSVGString, { ltres:0.1, qtres:1, scale:10, strokewidth:5 } );
// This uses the 'posterized2' option preset and appends the SVG to an element with id="svgcontainer"
ImageTracer.imageToSVG(
'panda.png',
function(svgstr){ ImageTracer.appendSVGString( svgstr, 'svgcontainer' ); },
'posterized2'
);
// The helper function loadImage() loads an image to a canvas, then executing callback:
// appending the canvas to a div here.
ImageTracer.loadImage(
'panda.png',
function(canvas){ (document.getElementById('canvascontainer')).appendChild(canvas); }
);
// ImageData can be traced to an SVG string synchronously.
ImageTracer.loadImage(
'smiley.png',
function(canvas){
// Getting ImageData from canvas with the helper function getImgdata().
var imgd = ImageTracer.getImgdata( canvas );
// Synchronous tracing to SVG string
var svgstr = ImageTracer.imagedataToSVG( imgd, { scale:5 } );
// Appending SVG
ImageTracer.appendSVGString( svgstr, 'svgcontainer' );
}
);
// This will load an image, trace it when loaded, and execute callback on the tracedata:
// stringifying and alerting it here.
ImageTracer.imageToTracedata(
'smiley.png',
function(tracedata){ alert( JSON.stringify( tracedata ) ); },
{ ltres:0.1, qtres:1, scale:10 }
);
// imagedataToTracedata() is very similar to the previous functions. This returns tracedata synchronously.
ImageTracer.loadImage(
'smiley.png',
function(canvas){
// Getting ImageData from canvas with the helper function getImgdata().
var imgd = ImageTracer.getImgdata(canvas);
// Synchronous tracing to tracedata
var tracedata = ImageTracer.imagedataToTracedata( imgd, { ltres:1, qtres:0.01, scale:10 } );
alert( JSON.stringify( tracedata ) );
}
);Node.js Command line interface example:
imagetracerjs/nodecli>node nodecli ../panda.png outfilename panda.svg scale 10
Expected result:
imagetracerjs/nodecli/panda.svg was saved!
CLI parameter names are supported both with and without trailing dash: -scale 10 and scale 10 are both correct.
Almost all options are supported, except pal and layercontainerid.
"use strict";
var fs = require('fs');
var ImageTracer = require( __dirname + '/../imagetracer_v1.2.6' );
// This example uses https://github.com/arian/pngjs
// , but other libraries can be used to load an image file to an ImageData object.
var PNGReader = require( __dirname + '/PNGReader' );
// Input and output filepaths / URLs
var infilepath = __dirname + '/' + 'panda.png';
var outfilepath = __dirname + '/' + 'panda.svg';
fs.readFile(
infilepath,
function( err, bytes ){ // fs.readFile callback
if(err){ console.log(err); throw err; }
var reader = new PNGReader(bytes);
reader.parse( function( err, png ){ // PNGReader callback
if(err){ console.log(err); throw err; }
// creating an ImageData object
var myImageData = { width:png.width, height:png.height, data:png.pixels };
// tracing to SVG string
var options = { scale: 5 }; // options object; option preset string can be used also
var svgstring = ImageTracer.imagedataToSVG( myImageData, options );
// writing to file
fs.writeFile(
outfilepath,
svgstring,
function(err){ if(err){ console.log(err); throw err; } console.log( outfilepath + ' was saved!' ); }
);
});// End of reader.parse()
}// End of readFile callback()
);// End of fs.readFile()It's possible to process the traced geometry and color data before SVG rendering. This example simplify_interop.html shows polyline simplification. You need to download simplify.js from https://github.com/mourner/simplify-js .
ImageTracer is available as an InkScape extension: https://inkscape.org/~MarioVoigt/%E2%98%85imagetracerjs-for-inkscape-1x
Thanks Mario Voigt!
See Process overview and Ideas for improvement
This is free and unencumbered software released into the public domain.
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