softMaskMatte
The /Matte colour of the /SMask, converted to RGB. When it is set, the colour samples were preblended with it (ISO 32000-1, 11.6.5.3), and toRgbaBytes undoes that blend. Null when the soft mask has no /Matte.
The /Matte colour of the /SMask, converted to RGB. When it is set, the colour samples were preblended with it (ISO 32000-1, 11.6.5.3), and toRgbaBytes undoes that blend. Null when the soft mask has no /Matte.