Original: TIFF has not had a major update since 1992 , though several Aldus\/Adobe technical notes have been published with minor extensions to the format , and several specifications , including TIFF\/EP ( ISO 12234-2 ) and TIFF\/IT ( ISO 12639 ) have been based on the TIFF 6.0 specification .
Simplified: TIFF was chosen as the native format for raster graphics in the NeXTstep operating system ; this TIFF support carried over into Mac OS X. Adobe Systems , which acquired Aldus , now holds the copyright to the TIFF specification .