Does gimp have optical filter imitations?

[Ofnuts]

(12-27-2017, 01:25 AM)godek Wrote: Is there any books, online courses and or tutorials you guys recommend for learning all these programs including gimp? I know there is gimp for photographers. But what about darktable, rawtherapee, rawstudio??? Can you just do a class room in a book with photoshop and try to apply what you learn there to open source apps?

RawPedia (which is actually a expanded RawTherapy user's guide) has plenty of info.

The "theory" is common to all applications.