Is there an easier way to fill in the lines in a scanned drawing. Easier than just tracing the whole thing with the brush tool. I scanned in my drawing and then used threshold to get rid of the paper background, but the lines are incomplete and pixelated with white. A little help would be greatly appreciated. I'm not a pro and am doing this for a safety eduactors group. Thank you.enter image description here

  • Have you tried tracing?
    – benteh
    Commented Jan 22, 2016 at 17:57
  • I tried tracing with the brush tool but I'm not great at it with my mouse. as think that there was a way to make the lines sharper with some type of blur or other filter, but I'm not educated enough to know which ones to use or how.
    – CeeLee72
    Commented Jan 22, 2016 at 18:34
  • Is this meant to be printed on offset? Where will this graphic be used, what kind of document?
    – go-junta
    Commented Jan 22, 2016 at 23:28

1 Answer 1


You can fill-in the holes in the outline by doing:

  • Select-by-Color (click on black outline)
  • Select > Grow (1px)
  • Select > Shrink (1px)
  • Bucket-Fill (whole selection) with black

Unfortunately, in this particular case, this will still leave a rather jagged outline because your earlier thresholding to remove the background has also removed all the anti-aliasing. So to produce a smooth outline, convert the selection to a path and back again before bucket-filling, thus:

  • (first three steps as above)
  • Select > To Path
  • (right-click in the Paths dialog) Path to Selection
  • create a new layer (white)
  • Bucket-Fill (whole selection) with black

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