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    <p>Alternatively, you could use something like:</p> <pre><code>Table[Colorize[ MorphologicalComponents[Blur[ColorNegate@comp1, i], .05]], {i, 1, 60, 10}] </code></pre> <p><img src="https://i.stack.imgur.com/w6hZd.png" alt="enter image description here"></p> <p>You may also use <code>Dilation</code>, depending upon what kind of regions you want as a result</p> <pre><code>Table[Colorize@ MorphologicalComponents@Dilation[ColorNegate@comp1, DiskMatrix@i], {i,1,60,10}] </code></pre> <p><img src="https://i.stack.imgur.com/BFj6Q.png" alt="enter image description here"></p> <p>BTW, here you have a way to use <code>FindClusters</code>, not very efficient and probably with non-intuitive results:</p> <pre><code>ImageRotate[Rasterize[ Show[ ListPlot@ FindClusters[Position[ImageData@Binarize@ColorNegate@comp1, 1, {2}], 3], Axes -&gt; False, AspectRatio -&gt; Automatic]], 3 Pi/2] </code></pre> <p><img src="https://i.stack.imgur.com/qeoYs.png" alt="enter image description here"></p> <p><strong>Edit</strong></p> <p>Probably you can manage the <code>FindClusters</code> options to get better results. For example:</p> <pre><code>ImageRotate[Rasterize[Show[ ListPlot@ FindClusters[ Position[ImageData@Binarize@Rasterize[ColorNegate@comp1, RasterSize -&gt; 200], 1, {2}], 3, Method -&gt; {"Agglomerate", "Linkage" -&gt; "Complete"}], Axes -&gt; False, AspectRatio -&gt; Automatic]], 3 Pi/2] </code></pre> <p><img src="https://i.stack.imgur.com/bbeJG.png" alt="enter image description here"></p> <p>And from here, you may also go to the Convex Hull: </p> <pre><code>&lt;&lt; ComputationalGeometry` fc = FindClusters[ Position[ ImageData@Binarize@ Rasterize[ColorNegate@comp1, RasterSize -&gt; 200], 1, {2}], 3, Method -&gt; {"Agglomerate", "Linkage" -&gt; "Complete"}]; ImageRotate[Graphics[Polygon@(#[[ConvexHull[#]]]) &amp; /@ fc, Frame-&gt;True], 3 Pi/2] </code></pre> <p><img src="https://i.stack.imgur.com/eOaVG.png" alt="enter image description here"></p>
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    1. COThank you very much belisarius ! The last one is exactly what I am computing. Like Mr.Wizard & Yoda, I have no idea what you are doing, but it is magical at each time !
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    2. CO+1 for an awesome complete implementation using so many diverse parts of the underlying Mathematica system.
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    3. CO@Verbeia That is exactly why I find Mma so fun to use
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