In high- resolution color representations in True Color, the three colorsRGB( red, green, blue) are each transmitted in one channel with 8 bits. For additional color information, for example for fogging, transparency or alpha bending, an additional byte representing the alpha channel is provided in some applications in addition to the three primary colors.
Often the alpha channel is also used to define the transparency. In this case, the highest transparency can correspond to the value "0" in one application, while in another it can correspond to the value 255 and thus the full opacity or the lowest opacity. Files that include the alpha channel in addition to RGB are called RGBA files.