Maybe the contours would not match exactly, but there would be sufficiently close to let you simplify them and delete properly doublons of contours. Then apply potrace's or VectorMagic's vectorization on it.Īt the end, you will get a set of contours. for each subspace, binarize the input image, drawing every pixel white if inside the subspace and black otherwise.Something like an algorithm computing the Voronoi partition of the input subset would do the job quite well at once use for example qhull for that. for each colour of the input subset of colours, find the subspace of the colour space which is "nearest" from the selected colour than from any other colour.If you have a subset of colours to be used as input, I advise you to folow the following algorithm: I think VectorMagic builds its contours based on the gradient/laplacian of the input image, that's why you cannot impose any set of colours. This step is optional, made by a separate program, so you can use potrace but in a different manner, by constructing yourself several versions of binarized images. The thing is it first converts the input image into a luminensce one, and then binarize it. There are numerous other vector formats: CDR is the CorelDRAW native format and XAR is the Xara Xtreme native format, to name a couple.There is the opensource library/program potrace which performs a fine vectorization. Line+spline as well as line only output modes. Some programs have difficulty reading DXF files with splines (curves), so the Desktop Edition supports The AI format is fairly widely supported, but is less ubiquitous than the EPS format, and most programs that read AI can also read EPS.Ī CAD format from Autodesk, used by CAD tools from many different vendors. The native format of Adobe Illustrator is the AI format (Adobe Illustrator Artwork), a modified version of the older EPS format. Support for reading and editing PDF files is much more limited. Those tools work with any program that is able to print. (third party tools that perform the same task are also for sale). Further information on the SVG format may be found on the official SVG website.Īdobe's PDF format (Portable Document Format) is very widely used as a general purpose platform-independent document format.Īnd while it is not exclusively used as such, it is also a very good vector image format.Īdobe gives away the Acrobat PDF reader, but sells the tools required to create PDF files Inkscape and recent versions of Adobe IllustratorĪnd CorelDRAW have good support for reading and writing SVG. The W3C standard vector image format is called SVG (Scalable Vector Graphics). Ghostview can read it very well but does not have any editing capabilities. It is widely supported as an export format, but due to the complexity of the full format specification, not all programs that claim to support EPS are able to import all variants of it.Īdobe Illustrator and recent versions of CorelDRAW have very good support for reading and writing EPS. This increases the flexibility you have when considering data sources and processing methods for solving a GIS problem. It is the standard interchange format in the print industry. Converting between raster and vector formats allows you to make use of both raster and vector data when solving a GIS problem, as well as using the various analysis methods unique to these two forms of geographic data. In any case, all of the variants of BMP should be avoided when possible, as they use little to noĬompression and consequently have unnecessarily large file sizes.Īdobe's EPS format (Encapsulated PostScript) is perhaps the most common vector image format. Most modern image editing tools are able to read both. Own formats, both of which are called BMP. There are actually several BMP formats (BitMaP). Vector Magic recommends using the PNG format when storing logos as bitmaps. This format is widely supported by web browsers and image viewers/editors. The best of the lossless image formats is called PNG (Portable Network Graphics). They are more suitable for things like logos. These store an exact pixel-by-pixel representation of the image, but require more space. We do not recommend using JPEG files for rasterized vector art, as the compression artifacts substantially degrade the quality of the image near edges. ![]() It has excellent compression characteristics and has the nice feature that the user may specify what level of compression they desire, trading off fidelity for file size. One of the most widely-used image formats. They are also commonly used on the web to save bandwidth. They are best suited to photographs and other images where perfect accuracy is not important. These have smaller file sizes but do not store a perfect copy of the image. Some of the most common are: JPEG, PNG, GIF, BMP, and TIFF.īroadly speaking, they fall into two categories: Lossy formats There is a large number of different bitmap formats.
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