Layer Background Color. Specifies the background color and opacity of the current layer.
Gray, RGB, or CMYK color value, with or without alpha.
Transparent and semi-opaque areas within the bounding rectangle of the layer are filled with the specified color afteropac=, rotate=, and extend= are applied.
Layer attribute. Applies to current layer or to layer 0 if layer=comp. Ignored by effect layers.
color is assumed to exist in the working color space corresponding to the pixel type of color. color is converted accurately if the final layer image has a different pixel type.
0,0,0,0 (fully transparent).