Flood Fill

Fills an area with a single color or a continuous gradient. Does not work on grayscale images.

Solid

fills a region with a constant color

Vert.Gradient

- fills a region with colors increasing or decreasing top to bottom

Horiz.Gradient

- fills a region with colors increasing or decreasing left to right

Normal

- Pre-select an area beforehand by dragging a rectangular region with the mouse, or double-clicking on an object. The entire selected region or object will be filled.

Interactive

- Click inside each object to fill. The objects must be completely surrounded by a boundary which is between the ``lower boundary color'' and the ``upper boundary color''. If there are gaps in the object's border, the color will spill out onto the area surrounding the object. When finished, click on the main ``Cancel'' button, or press Esc.

Note: ``Flood fill'' and ``Add/Remove Gradient'' both can create color gradients, but work in different ways. Flood fill adds color to all pixels in a region bounded by user-specified upper and lower RGB values and therefore determines the area to be colored automatically. ``Add/Remove Gradient'' adds the gradient to the entire selected area. It is therefore easier to control precisely where the color is added by selecting the desired area beforehand.