ICO Image Vectorization

Image vectorization is the process of converting bitmap images into vector graphics - Bezier curves, splines, and lines. You may want to vectorize bitmaps for a number of reasons - scaling, small file size, animation support, etc., or you just want to experiment with images and get some fun vectorizing effects. Either way, bitmap vectorization is a good experience if you’re interested in photography, painting, design, art, and web development.

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 ICO to vector graphics in C# using the Aspose.SVG API. What’s more, we provide an online Image Vectorizer for you to try real-time image to vector conversion.

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. 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 ICO to vector with default settings and you can download vectorized ICO 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 ICO 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 ICO 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 ICO 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 ICO 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 ICO image from the specified file
	using var document = vectorizer.Vectorize(InputFolder + "image.ico");
    // Save vectorized ICO as SVG file 
	document.Save(OutputFolder + "image.svg");

Steps to Convert ICO to SVG in C#

To vectorize ICO 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 ICO from the specified file. The Vectorize() method takes the path to the image file and returns an SVGDocument.
  3. Save the vectorized ICO 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.


1. How can I vectorize ICO?

Aspose.SVG allows you to convert ICO to SVG in any way - online or programmatically. For example, you can vectorize ICO 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 ICO 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 ICO File Format?

The ICO file format is an image file format for computer icons in Microsoft Windows. ICO files contain one or more small images of varying sizes and color depths so that they can be scaled appropriately. ICO images come in different size, colour support and resolution to suit the requirements of the display. On Windows, all executable files that display an icon for the user on the desktop, start menu, or Windows Explorer must have an icon in ICO format. In terms of the structure, the images in the ICO file are the closest to BMP, but fundamentally different from them in the presence of an additional image - a mask superimposed on the background with the help of bit operations, which allows you to realize transparency of the image.

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)