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I'm using GIMP to prepare this PNG file for vectorization in Inkscape. I've noticed that the vectorization process makes removing these lines far more tedious after the vectorization than before. Removing these lines by using the "Select by Color" tool leaves transparent pixels and I'd like to know how I can give these pixels the colour one could expect them to have based on the colours of neighbouring squares. Is there any way to systemically extrapolate these colours?

This is the PNG I'm editing. enter image description here

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    You can try with Heal Selection making the selection very small and use few surrounding pixels only. But it will definitely leave unwanted artifacts. – Takkat Dec 25 '14 at 9:09
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Removing black lines using the heal selection tool:

removing black lines

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    You should add that this needs a third-party script - IIRC Heal selection also requires the third-party Resynthesizer plug-in and is usually be packaged with it. – Michael Schumacher Dec 25 '14 at 21:35
  • Where do I get this extension from? – BH2017 Dec 27 '14 at 1:06
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    other answers should get the credit, but here's where you can find the plugin github.com/bootchk/resynthesizer – mmacvicar Nov 3 '16 at 2:36

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