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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.

This format is used to display bitmap images in the SunOS operating system. It uses the RLE compression algorithm and supports between 1 and 32 bits per pixel. It can be created in the Unix environment, and it is used for certain types of research projects. It is primarily used on Sun Microsystems computers.