Adds the values of the constituent colors of the display object to the colors of its background, applying a ceiling of 0xFF.
This setting is commonly used for animating a lightening dissolve between two objects.
For example, if the display object has a pixel with an RGB value of 0xAAA633, and the background pixel has an RGB value of 0xDD2200, the resulting RGB value for the displayed pixel is 0xFFC833 (because 0xAA + 0xDD > 0xFF, 0xA6 + 0x22 = 0xC8, and 0x33 + 0x00 = 0x33).