Hi Graeme, I sent you some information about a profile that I thought had a problem with the perceptual mapping. However, on looking at other profiles I find that the perceptual mapping in Argyll shows the same issue with all of them. For example, here is a comparison between a paper profiled with i1Profiler and one profiled with Argyll: i1Profiler Colorimetric: DMax 2.44, Volume: 93,000 Argyll Colorimetric: DMax 2.5, Volume: 97,000 i1Profiler Perceptual: DMax 2.46, Volume: 92,000 Argyll Perceptual: DMax 2.08, Volume: 90,000 This is from Beta RGB, with Beta RGB specified in colprof (i1Profiler doesn't require a source profile to be specified). As you can see, the colorimetric mapping is excellent in Argyll, whereas the perceptual mapping is not at all good. It seems as though your interpretation of Perceptual is very strict, with an overall squeezing in of the out-of-gamut colors. This results in a lower gamut volume ... and, more critically, a very much lower DMax. Is this correct, or is there a bug in the software? I've sent you all the data so you should be able to see if I am doing something wrong. If this is not a bug and not a user error, then, IMO, the perceptual mapping in Argyll is almost unusable as is. Robert