This tool will fill the area clicked with the color that
corresponds to the mouse button used. The 'area clicked' in this context means
all areas around the point clicked that have the same color with it. When the left mouse button is clicked, color#1 is used as the fill color and if the right button is clicked, color#2 is used. When a border color is needed, the other color is used.
Options
Normal
This option does a normal floodfill. The pixel under the mouse pointed and all neighbouring pixels of the same color are replaced with the fill color. The filling stops when pixels of other colors are encountered.
Border
This option will fill an area with the fill color until it encounters a border drawn with the
other color. If, for example, you've selected green and red, it will fill with
green the area bounded by a red line. If no red
border is encountered, or it does not enclose the area completely, it will fill
the whole image.