[ Thanks to Andrei for this link.
]
“First of all sK1 is oriented for “prepress ready”
PostScript & PDF output.The major sK1 features:
CMYK colorspace support
CMYK support in Postscript
Cairo-based engine
Color managment
Universal CDR importer (7-X3 versions) Modern Ttk based (former
Tile widgets) user interface”