It's likely that I'm a little dense on this but I've read Graeme's documentation over multiple times regarding the use of this command and gamut mapping. I want to make a profile for my printer and I've printed patch targets and read them. How do I handle '-S' when I'm ready to run Colprof? We don't know what the gamut behavior of the printer is at this point only from research that it's broader than AdobeRGB1998 and smaller than ProPhoto. ProPhoto is the default color space for Adobe Lightroom and the recommended color space for Photoshop because of the larger gamut than AdobeRGB1998. Does this mean that I should use '-SProPhoto.icc' in my command line or use '-nS'. It's not clear to me and assistance would be appreciated. Alan