Flood fill

The Flood Fill option fills any enclosed area with either black or white. After selecting the Paint Roller icon, place the cursor inside the area to fill, and click any mouse button to fill with white or black. Note that this function is available for black / white images only. If the shape being filled has any gaps in its border, the filling pattern leaks through and fills the entire drawing area. Accidentally filled part can be removed by using the undo option.