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The paintbrush and pencil tools.
The Paintbrush tool
The Paintbrush tool is a painting tool that applies the
current foreground color with a soft anti-aliased brush stroke.
You can use the Paintbrush dialog box to modify the operation
of the Paintbrush tool. The paintbrush tool has a host of different brush
types, sizes, and also has an option for "wet edges" which causes
the paintbrush to create a translucent line with darker edges. See my
examples of paintbrush 'brush' types below.

Various paintbrush types.
The Pencil tool
The Pencil tool is a painting and image-editing tool
that applies the foreground color to a single pixel in your images or
paints a one-pixel wide stroke. See my examples below. There are similar
brush types to that of the paintbrush, however you can not get that "wet"
look like that of the paintbrush tool. However it is an excellent tool
for doing pixel by pixel work on an image.

Various pencil types.
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