The simplest use is to fill an area defined by two different objects. Select the Paint Bucket Tool ( , Shift+F7) from the Tool Box and then click in the overlapping region. A new object is created with the current Fill color.
The cursor position when clicking determines the starting point of the fill region. The filling algorithm recursively adds neighboring areas to the region until pixels are found that don't meet the criteria determined by the parameters in the Tool Controls.
The Threshold parameter controls how close a color must match the color (or Alpha) under the cursor. Lower thresholds will match a smaller range.
The Fill by parameter controls what color value is used to determine the the color matching. Choices are: Visible Colors (default), Red, Blue, Green, Hue, Saturation, Lightness, and Alpha.
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