Simple raster image tracer and vectorizer written in JavaScript.

• Node.js Command line interface (Enhancement Issue #13)
• FIXED: Pathomit problem thanks to EusthEnoptEron (Issue #14)
• options.corsenabled for CORS Image loading thanks to neel-radica (Issue #12)

• FIXED: missing hole in path because of incorrect bounding box (Issue #11)
• Posterized3 option preset
• Changed svgpathstring() arguments to simplify getsvgstring()

• FIXED: Gaussian blur preprocessing is now independent of DOM and canvas, thus working directly with Node.js (Issue #9)

This is a major update, changing some internal logic and option default values. The API is compatible, so it should work out of the box.

• FIXED: transparent holes are now possible. ( Issue #7 and #8 )
• Deterministic output by default: options.colorsampling = 2 ; options.mincolorratio = 0 are deterministic and the defaults now.
• Right angle enhancing: options.rightangleenhance ( default : true )
• Option presets (see below)
• Custom strokewidth with options.strokewidth ( default : 1 )
• Line filter with options.linefilter ( default : false )
• Simplified getsvgstring(); options.desc = false by default; splitpoint = fitpoint in fitseq(); small bugfixes and optimizations

Version history and README for the old 1.1.2 version is here.

Are you confused by the many parameters and their meaning in the options object? Just use a preset like this:

// This uses the 'Posterized2' option preset and appends the SVG to an element with id="svgcontainer"
ImageTracer.imageToSVG(
	'panda.png', // Input filename
	function(svgstr){ ImageTracer.appendSVGString( svgstr, 'svgcontainer' ); }, // callback function to append the SVG to the svgcontainer div
	'Posterized2' // Option preset
);

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' .

Check out imagetracer_options_gallery.html or a bigger image.

Include the script:

<script src="imagetracer_v1.2.3.js"></script>

Then

// Loading smiley.png, tracing and calling alert callback on the SVG string result 
ImageTracer.imageToSVG( 'smiley.png', alert );

More examples:

// 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 ) );
		}
);

Please read nodecli/nodecli.js

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!

input file name must be the first argument REQUIRED ; outfilename or -outfilename REQUIRED ; ltres or -ltres ; qtres or -qtres ; pathomit or -pathomit ; rightangleenhance or -rightangleenhance ; colorsampling or -colorsampling ; numberofcolors or -numberofcolors ; mincolorratio or -mincolorratio ; colorquantcycles or -colorquantcycles ; blurradius or -blurradius ; blurdelta or -blurdelta ; strokewidth or -strokewidth ; linefilter or -linefilter ; scale or -scale ; roundcoords or -roundcoords ; viewbox or -viewbox ; desc or -desc ; lcpr or -lcpr ; qcpr or -qcpr ; corsenabled or -corsenabled

ImageTracer version >= 1.2.0 is deterministic by default, but randomization can be turned back on.

This is relevant to versions < 1.2.0 : options for deterministic tracing

imagedata is standard ImageData here, canvas is canvas .

imagedata is standard ImageData here, canvas is canvas . There are more functions for advanced users, read the source if you are interested. :)

The almost complete options object:

var options = {ltres:1, qtres:1, pathomit:8, rightangleenhance:true, colorsampling:2, numberofcolors:16, mincolorratio:0, colorquantcycles:3, blurradius:0, blurdelta:20, strokewidth:1, linefilter:false, scale:1, roundcoords:1, lcpr:0, qcpr:0, desc:false, viewbox:false, corsenabled:false };

Adding custom palette. This will override numberofcolors.

options.pal = [{r:0,g:0,b:0,a:255}, {r:0,g:0,b:255,a:255}, {r:255,g:255,b:0,a:255}];

The 1.1.2 version can be used like this: ImageTracer112.imageToSVG()

Include the script:

<script src="imagetracer_v1.1.2.js"></script>

Then

// Loading smiley.png, tracing and calling alert callback on the SVG string result 
ImageTracer112.imageToSVG( 'smiley.png', alert );

See Process overview and Ideas for improvement

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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