Image Vectorization

Image vectorization is the process of converting bitmap images into vector graphics - Bezier curves, splines, and lines. Vectorization is helpful because the image will not pixelate when you enlarge it. Scaling without losing quality, small file size, and animation support - are only a few advantages of vectorized images. Whether you are into painting, design, art, printing, architecture or web development, vector images are an essential part of the profession. On the other hand, you just can experiment with images and get some fun vectorizing effects. Aspose.SVG for .NET API offers a high-speed C# library that you can use for different SVG parsing tasks. The ImageVectorization Namespace includes classes and interfaces for implementing the image vectorization process. In this article, we’ll look at how to convert Image to vector graphics in C# or using an online Image Vectorizer.

Online Image Vectorizer

If you need to vectorize images, use our free online tool! Image Vectorizer supports JPEG, JPG, PJP, PJPEG, PNG, BMP, ICO, GIF, TIFF, WEBP, XBM and other bitmap formats. It offers various options for preprocessing bitmaps before saving them to SVG format. You are able to interactively manage the vectorized SVG file by using controls linked with proper vectorization options. Convert your images into scalable and clear vector art just now!

How to use Image Vectorizer?

  1. First, load the raster image from a local file system in JPEG, JPG, PJP, PJPEG, WEBP, PNG, BMP, ICO, GIF, TIFF, XBM or other bitmap format. You will see three windows - Source Image, Quantized Image and Vectorized Image - with the preview of initial, color-quantized and vectorized images.
  2. Image Vectorizer converts Image to vector with default settings and you can download vectorized Image as an SVG file. But for getting a better result, you can handle the quantization and vectorization processes with two settings sidebars. Click “Quantize” button to apply quantization settings, click “Vectorize” button to apply vectorization settings and convert Image to SVG.
  3. Click the “Download” button to get the resultant.

Image Vectorizer converts raster bitmap images into vector artwork constructed from outlines. The vectorization algorithm includes the next steps: color quantization, contour tracing, trace smoothing, trace simplification, and building SVG path elements from the traces. Apply custom settings to get the best Image vectorization result.

Quantization Options

Color quantization is a process of selecting the limited number of colors to use in an image. It is applied when the color information of an image is to be reduced. Color quantization is a very complex process involving a number of factors. This can be implemented using different algorithms. Each of the algorithms determines which colors from the larger set of colors remain in the new image and how the discarded colors are mapped to the remaining ones.

  • colors - desired palette size;
  • method - histogram methods that implement various color quantization algorithms;
  • minHueCols - is a parameter that works with color gradients;
  • scale - or scaling factor - configurable for finer or coarser sampling of colors;
  • grayscale - you can convert the image to grayscale by clicking the checkbox.

Vectorization Options

  • threshold - is responsible for setting the number of pixels to mark the contour;
  • severity - affects contours’ smoothing and determines the extent of the region considered by query point the Nearest Neighbor approach;
  • line-width - affects lines’ width for marking the contours;
  • stencil - turns an ordinary image or photo into an outline image that can be used as a stencil for graffiti-like effects;
  • trace paths - you can view the points in a curve that are responsible for building path segments.

Vector graphics are the best for creating logos, icons, page layouts, maps, graphs, line arts, illustrations, technical drawings and more. It is not the most suitable format for continuous-tone images with blends of color or editing photographs. However, vectorizing photos can result in impressive artistic effects that can be interesting and useful.

How to vectorize Image in C#

Aspose.SVG for the .NET API provides classes and methods that allow you to implement the image vectorization process and work with various pre-processing options for images before saving them in vector format. Processing involves controlling the following vectorization options: TraceSimplifier, TraceSmoother, PathBuilder, etc.

Convert Image to SVG in C#

	// Initialize an instance of the ImageVectorizer class
	var vectorizer = new ImageVectorizer
		//optionally set configuration
        Configuration =
			//optionally set path builder
            PathBuilder = new BezierPathBuilder {
			//optionally set trace smoother
            TraceSmoother = new ImageTraceSmoother(1),
                ErrorThreshold =  30,
                MaxIterations = 30
            ColorsLimit = 25,
            LineWidth = 1
    // Vectorize image from the specified file
	using var document = vectorizer.Vectorize(InputFolder + "image.png");
    // Save vectorized Image as SVG file 
	document.Save(OutputFolder + "image.svg");

Steps to Convert Image to SVG in C#

To vectorize Image with Aspose.SVG, you should follow a few steps:

  1. Initialize an instance of the ImageVectorizer class. Use one of ImageVectorizer() constructors and specify configuration properties.
    • TraceSmoother property sets the trace smoother. It is used to smooth out fragments of contours.
    • TraceSimplifier property sets the trace simplified. As a result, the trace curve will be built composed of line segments with fewer (or bigger) points.
    • PathBuilder property sets the SVG path segments builder and affects how sharply the curve bends at the control points.
  2. Vectorize Image from the specified file. The Vectorize() method takes the path to the image file and returns an SVGDocument.
  3. Save the vectorized Image as an SVG file. Use the Save() method and pass to it the output path.

In the documentation chapter Vectorization - Basic Overview , you will find image vectorization info, a description of the image vectorization process and vectorization options, learn how to vectorize raster images such as PNG, JPG, BMP, TIFF, GIF, ICO into an SVG document. You will consider a few C# examples that demonstrate the ImageVectorization functionalities and the effect of configuration properties on the vectorization result.
Aspose.SVG offers a Free Online Image Vectorizer allows you to convert JPG, PNG, BMP, TIFF, ICO, and GIF bitmap images to vector graphics. Using this App, you may apply a set of options for obtaining the perfect result. Save your time and check this Image Vectorizer to get all the benefits of vector graphics!


1. How can I vectorize Image?

Aspose.SVG allows you to convert Image to SVG in any way - online or programmatically. For example, you can vectorize Image in real-time using Online Image Vectorizer that converts your images quickly and with high quality. On other hand, you can use Aspose.SVG for .NET API to vectorize Image programmatically.

2. What is a raster to vector conversion?

The process of image conversion from raster to vector is called image vectorization. It is a complex computational process that converts a bitmap image made up of pixels into a vector image made up of lines, curves, and other geometric shapes.

3. What is the image vectorization for?

Vector images are essential for any professional who works with drawings, graphics, or sketches. Many designers, printers, architects, and artists often choose to work with sketches or drawings as vector images. And they have good reasons! Unlike bitmap graphics, vector arts are resizable and scalable without losing any quality, and they will still display just as clearly. Also, vectorization can be used to update or recover images.
Vector images are what you need to produce banners, logos, maps, signs, embroideries, engravings, graphs, blueprints, etc.

4. How is the vectorization occur?

The vectorization process uses color image quantization - a technique that reduces the number of different colors used in an image, intending that the new image should be as visually similar as possible to the original one. Then, the Vectorizer replaces all the same colored spots or pixels with geometric shapes or curves using a set of contour tracing algorithms. The final step is to convert the tracing points to SVG path lines and Bezier curves and add them to the SVG document.

What is Image File Format?

There are two main types of digital image files — raster and vector. Popular types of raster images include JPEG, PNG, BMP, TIFF, and GIF file formats. A bitmap is a two-dimensional array that maps colors to pixels at a particular location. A raster image is a much larger file than a vector one. Raster formats are suitable for photographs or pictures with color gradients. But one of their main disadvantages is losing quality when scaling. Because the pixel number is fixed, raster images can become distorted or blurry when resized to fill a bigger or smaller space. Increasing the size of an image with too few pixels can cause pixelation, which isn’t usually desirable.

What is SVG File Format?

SVG files are Scalable Vector Graphics Files that use XML-based text format to describe an image’s appearance. In an SVG file, images are described as geometric primitives: lines, curves, shapes, text, etc. Vector objects are built and stored as a set of commands, numbers, formulas, and not in a pixel grid, as in bitmap images. The word Scalable refers to the fact that SVG can be scaled to different sizes without losing any quality. A text-based description of such files makes them independent of resolution. It is one of the most used formats for website building and print graphics to achieve scalability. SVG files can be viewed/opened in almost all modern browsers including Chrome, Internet Explorer, Firefox, and Safari.

Get Started with .NET SVG API

If you are interested in developing scalable vector graphics and their application, install our flexible, high-speed Aspose.SVG for .NET API with a powerful set of interfaces for C# and other .NET programming languages.
Install from command line as nuget install Aspose.SVG or via Package Manager Console of Visual Studio with Install-Package Aspose.SVG. Alternatively, get the offline MSI installer or DLLs in a ZIP file from downloads. Aspose.SVG for .NET API is a standalone library and does not depend on any software for SVG document processing.
For more details about C# library installation and system requirements, please refer to Aspose.SVG Documentation.

Other Supported Vectorizers

Text to Vector (SVG Text)
JPG to SVG (JPEG Image)
PNG to SVG (Portable Network Graphics)
Image to SVG (Raster Image)
BMP to SVG (Microsoft Windows Bitmap)
GIF TO SVG (Graphical Interchange Format)
TIF to SVG (Tagged Image File Format)
ICO to SVG (Windows Icon)
Stencil Drawing (Stencil Maker)