I have one laptop with ubuntu 18.04 which was upgraded from 16.04. Darktable is from pmjdebruijn repository. Recently I have installed fresh ubuntu 18.04 on my second laptop and duplicated my working environment. Darktable on my new laptop is also from pmjdebruijn repo.
During my switch to new laptop I couldn’t get the same results on both laptops. All my work is on external drive therefore when opening RAW image the pipeline should be consistent. Occasionally I’m also examining my work on third computer with Ubuntu 16.04 and results are consistent with the old laptop.
On my new laptop images were flat, desaturated. I was suspecting that monitor profile was improper so I have recalibrated it (it’s Eizo) with no luck. Only after few days of researching I figured out that when I switch demosaic algorithm from PPG to other like AMaZE the image looks normal as on the old laptop. Generally mangling with demosaic on old laptop gives no visible improvement so I’m using PPG.
In the end I’m using AMaZE by default on my new laptop but I’m curious is there any logic behind such behavior? Different library somewhere?