With the 6th version of SPP additional color modes were introduced. Currently Sigma’s RAW converter has 10 of these modes, whereby some of them – like “Sunset Red” and “Cinema” – are somewhat gimmicky. With the Merrills and SPP 5.X.X „neutral“ was, or rather still is, the color mode of my choice. With the Quattro and SPP 6.X.X some changes were made to the way how raw date is being interpreted in regards to colors and tonal values, so that “neutral” looks dull and desaturated, while “standard” is very convincing color and contrast wise, but has its problems with scenes with high dynamic range (the highlight roll off is too abrupt). While researching on the internet I only found a few posts about the “portrait” color mode, all of which were claiming that it was rather soft concerning micro contrast and sharpness, in comparison to “standard”. What wasn’t mentioned in those posts, but what I found out while post processing my images, is that “portrait” is best at rendering high-contrast scenes/motifs and those with loads of bokeh.
I can only advise Quattro owners and SPP 6 users to try out the “portrait” color mode and form an opinion for themselves. As soon as I find time, I’m going to post a comparison of the most useful color modes. 🙂