The Paint Bucket tool is used to quickly fill large areas with color.
You can change the fill color using the Color panel, Swatches panel, or by clicking the image with the Eyedropper tool. To pick a color sample, press and hold the I key and then click the image with the Eyedropper tool. After the hotkey is released, the painting tool becomes active again.
The basic tool settings are shown in the Tool Options panel above the Image Window or by right-clicking on the image. To display the full list of parameters, press the tool icon in the Tool Options panel or use the F5 key. To specify the parameter settings, enter a numerical value in the parameter’s field or use the slider.
Opacity (0-100). The transparency of the fill relative to the background. The parameter determines the opacity of the color: the smaller the value, the more transparent the fill color and the stronger its interaction with background colors.
Tolerance (0-250). At the minimum value, the tool fills only pixels of the same color nearby to the one you click. The higher the value, the wider the range of colors to be filled.
Blend Mode. The parameter controls how the fill pixels are mixed with the ones of the layer. The program provides 16 blend modes.
Contiguous check-box. If the check-box is activated, only adjacent pixels of the same color are filled. If it is deactivated, all pixels of the same color throughout the image will be filled.
Anti-Aliasing check-box. The check-box eliminates irregularities in the boundaries of the fill area. To make the edge smoother, enable the check-box before using the tool.
All Layers check-box. If the check-box is enabled, the pixels are filled based on the merged color data from all visible layers. Otherwise, based on the color data of the current layer.
Press the Default button to set all settings to their default values.