M2 Mode for OpenColor Pantone Libraries

The Pantone libraries in OpenColor use the M2 measurement mode, rather than M0 or M1. This is the case in all GMG software products, including: OpenColor, ColorProof and ColorServer.

M2 is chosen for two main reasons:

1) Adobe use M2 for Pantone colours in all their applications. This keeps the GMG software consistent with Adobe products.

2) The use of M2 gives a better visual match when proofing.

You can read more about the different measuring conditions here:

https://supportuk.gmgcolor.com/hc/en-us/articles/210350825-Measurement-conditions