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This format is used for storing bitmap images in an Adobe Photoshop project file. It is stored in uncompressed form, and it includes color spaces, layers with masks, two-color settings, layer structures and other data that allow bitmap photos to be finely edited.

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.