Found some great postprocessing shaders on wiki, that I assume are layered to the whole scene, but not on a separate object (sephia, negative, emboss)

Q: how to use these shaders in c-script? (not in lite-c)

If you'd use lite-c it were easy.... I think there's something about that on the wiki, look for "postprocessing helpers" in the "code" section of the wiki.

do you have A6 pro?

EDIT: or a7?

A7 commercial

then you can just take c-lite code from there, c-script and lite-c can be mixed together.

Thanks a lot, I'll try!