A legacy format with RAW structure for storing photos taken with Canon cameras. It contains graphical information about data that was obtained through the lens without the use of hardware or software correction and compression. It contains metadata that identify shooting conditions and camera settings.
This format has the same color structure as RGB, but it includes an alpha channel that is used to display various levels of transparency. The transparency value is set from 0 to 1, where 1 corresponds to opacity. It is described using the CSS3 programming language.