Fills the selected region with the background color.
If ClearAlpha is true, the alpha channel is also cleared (set to the Alpha value, where 0 means fully transparent and 255 fully opaque). Note: This option has no no effect if the bitmap does not contain an alpha channel.
Note: ◼If ClearAlpha is true an Alpha Channel will be added to the image ◼To remove the area outside the selection, use CropSel