13.1.2 XBfe shape editing

The most basic operation for editing character bitmaps is to change black pixels to white or the reverse; put another way, inverting the pixel the mouse is on. You do this by clicking the third mouse button.

Technically, this is just a special case of changing more than one pixel: when you press the third button, the current pixel inverts; then, as you move the mouse, the pixels it touches change to the color the first pixel changed to. Thus, if you press the third button on a white pixel, the mouse effectively becomes a "black pen" (until you release the button).

13.1.2.1 Selections		Marking pixel regions for later operations.
13.1.2.2 Enlarging the bitmap		Give yourself more room at the edges.