My brush keeps drawing gray-scales around my lines. I want to remove the gray pixels so I can use the bucket-tool without any problems.
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You want to use the pencil tool rather than the brush tool to get rid of the grey shades around a line:
Anti-aliasing actually means you do get the slightly fuzzy edges. Aliasing means that either a black or white value is used as an alias for the true shape - the brush is circular but you can't represent a circle with square pixels. Anti-aliasing attempts to prevent the problem of using either black and white to represent an area the curve passes through by representing this area as a shade of grey.