More information on the v4 specification and the advantages of v4 is available. While ICC recommends the use of v4 profiles wherever possible, it recognizes that v2 profiles continue to be used in some workflows and can give good results.Some recommendations on making v2 profiles are provided for developers.n PDF/X workflows, Ghent Work Group Process Control subcommittee previously recommended restricting ICC profiles in PDF/X to those made to the older v2 specification. The group is currently testing the use of v4 profiles in real world PDF/X-4 workflows.