Image type handling by external plugins

[caclark]

Image type handling (CR3, NEF etc.) is now done at compile time.
Would it be better if this was done by shared_modules (if that is the correct method), so that the user can opt to include whichever modules they require at run-time?

[przepompownia]

Would this have a noticeable impact on memory usage? I have almost all image types compiled, even though I don't use some of them. The exception is FITS, because Debian requires a Fortran installation for it.