CUPS Raster
From Just Solve the File Format Problem
				
								
				
				
																
				
				
								
				CUPS Raster is a raster graphics format associated with the CUPS printing system currently developed by Apple.
See also PWG Raster.
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Identification
CUPS Raster v1 files begin with "RaSt" or "tSaR".
CUPS Raster v2 files begin with "RaS2" or "2SaR".
CUPS Raster v3 files begin with "RaS3" or "3SaR".