The option Dithering->False is important here, otherwise the algorithm would try to minimize the quantization error by dithering which would lead to very small regions. You can specify the number of colors in the result (10 here) and later we will transform the regions of every color on after another into a vector graphic. One fast and easy way to segment this image is to use ColorQuantize. This depends strongly on the input and cannot always be prevented. Preferably, those regions should be not too small. Therefore, what you have to do is to break you input image into regions with similar colors, with whatever definition of similar.
In a vectorized image you want not only a realistic look but if possible only a few large regions to keep the number of polygons to a reasonable number. A usual 8 bit color image with 256^3 possible colors has in the worst case a different color for each pixel. The first thing one has to understand is that color vectorization happens in multiple scans, which means regions of equal color will be transformed in a polygon-representation.
Select 'single' if you’d like to create a single path from the image, or 'multiple' if you’d prefer many overlapping paths. Choose between single and multiple scans. In the following sections I explain what steps are necessary to vectorize a color image in Mathematica. To open Inkscape’s tracing engine, click 'Path' on the menu bar, then select 'Trace Bitmap.' 1 3. The only question was, whether it gives reasonable results. Then I read about how this is done in real applications and read the documentation to Potrace which is the underlying tracer of Inkscape.Īt this point it was clear to me, that we can achieve this with the tools included into Mathematica. I stumbled over this issue while thinking about this answer here where in my opinion a high quality vectorizer would be of great help. With good CPU and memory resources even in a very high quality. I am patient if I know what is happening.Yes, we can. The files of 3-5 MB take a while to work. It seems to be tracing reliably now.Īll of this raster to vector conversion is new to me. line drawing) and not so well for others (scans from screened color prints).
In my trying to find out what was really happening, I did, however, inadvertently "sign" my work. Inkscape has the ability to convert bitmap images into paths via tracing. I tried looking up any bug reports concerning the trace panel going dull or just not working. After bit tracing I could select even a speckle, delete paths, change path attributes, etc. I didn't have to do "break apart" nor "object to path". (I'm still learning) In any case the solution was multiple ungroups. It took 3 *ungroup* commands to get to the point that the status bar reported "Image 16263 x 11610: embedded in layer LAYER 1". Imported and then tried ungrouping the image. I tried the file I was *really* wanting to use.
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