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.
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.
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.