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In the example image, I am trying to fill a white area and the black pixel lines around it are being changed. Also, there are a few gray pixels created at the bottom corners, outside my outline. Why is all this happening and how can I prevent it?

enter image description here

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    Hi sketcherskt, welcome to GDSE. I went ahead and edited your question for clarity. If I mangled anything beyond your intention of recognition, feel free to roll back my edit or edit the question again. – Vincent Mar 4 '20 at 15:25
  • thanks for making my question more clearly written. – sketcherskt Mar 4 '20 at 15:34
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Look at the top of the screen, just below the pull-down menus. In the bar over there, once you select the fill tool, there is a tickbox labeled 'anti-alias'. Untick that.

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  • Thank you so much! – sketcherskt Mar 4 '20 at 15:34

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