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I have an image of a human brain, but I only need the contour of it; its outer shape and not everything that's on the inside of the brain. I tried using Trace Bitmap, but I still got the inside of the brain. Hope my question is clear and thanks in advance for any help.

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  • Welcome to GD.SE - Please look through tour to get a sense of our community – who we are and what we’re about. Then look over How to Ask and How to Answer a question to see what makes a good query here, and how best to frame it. We do ask that questions show their effort: show us what you tried and failed; tell us why the straightforward approach won't work; illustrate your question with sketches, screenshots or examples. I'm wondering why can't you just draw the contour? Consider editing your question to show us your efforts. Thanks! – GerardFalla Apr 1 '20 at 15:56
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    Usually that would be a manual operation - using the Bézier Tool (aka Pen Tool) to draw around the image, unless you can first fill the raster image a solid colour in a raster image editor, such as GIMP, but it's probably more trouble than it's worth TBH. – Billy Kerr Apr 1 '20 at 16:39
  • Perhaps you could find a silhouette image of a brain instead, then an auto trace would be easy. – Billy Kerr Apr 1 '20 at 18:08
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Using the Trace Bitmap feature provides a number of options. There may be an easier method than this, but consider to adjust the Brightness Cutoff threshold value with the Live Update ticked.

brain trace image

There's a small artifact in the lower left corner, probably left from my hasty edit, but the result is a solid shape. You can then remove fill, add or adjust stroke as desired.

If your computer is slow and/or you have a large number of objects in your image and document, you may find the Live Preview to be burdensome.

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    thx for the help, this seems like a fast method. – TheBlackKey Apr 2 '20 at 12:10

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