Identify salinity of water samples with images?

[Rangerguy]

I'm working on a code that could analyze water samples with bacteria colonies through images. I managed to work in a way to determine the amount of colonies, however, I'm also working a way to determine the salinity level. To any python programmer who has worked with science-focused programs, any advice on how I could work in a code like that?

[Larz60+]

perhaps something of interest here.