Thanks for the replies
But I can't do anything manually, the rendering pipeline must be automated.
So I must be able to specify the scene and the post-rendering effects in one shot, then launch the rendering process.
I checked and it seems that the flm file contains no such information: I tried resuming one from luxconsole, and it did not output post-processed images.
However I saw that luxrender has a command-line option to specify an options file, with the argument-C (or --configFile)
see screenshot attached.
Anyone knows what this option file is for, and where to find more information about it ?