In some other areas, similar efforts have been made by other organisations, taking account of national variations in printing techniques, expectations, and requirements. SWOP is a non-profit volunteer organisation, and concerns itself only with the United States. The organization publishes its own specification and ICC profile and runs a certification program.
Among other things, the organization specifies SWOP inks used in CMYK printing, colors of SWOP proofs, other physical qualities pertaining to printing. Specifications for Web Offset Publications, invariably abbreviated to SWOP, is an organization and the name of a set of specifications that it produces, with the aim of improving the consistency and quality of professionally printed material in the United States, and of certain other products, programs and endorsements related to their work. Comparison of some RGB and CMYK colour gamuts on a CIE 1931 xy chromaticity diagram
