The Pixel Tool draws pixel-aligned, hard-edged lines. This is in contrast to the Paint Brush Tool which may have a slight pixel variance due to its antialiasing.
Settings
The following settings can be adjusted from the context toolbar:
Width—the line thickness in pixels.
Opacity—how see through the brush is.
Flow—how fast the brush effect is applied (1% is very slow, 100% is immediate).
Hardness—how hard the edges of the brush are. The brush appears softer as the percentage decreases.
More—tap to display the Brushes dialog to access advanced brush settings.
Colour—tap to choose the stroke colour.
Force Pressure—Tap to control brush size with pressure if using a pressure-sensitive device. This overrides brush defaults.
Alternate (setting)—allows you to set the alternate brush mode behaviour to Undo from Snapshot, Erase, to Background colour.