have been requested to provide various versions of an Full HD ProRes PAL master, including an SD 16x9 version and an an SD 4x3 version. I havent been given more spec than that, so is it worth (or even do-able) keeping the codec as ProRes, or shall i re-encode it as uncompressed 8bit SD
As Ryan wrote.
There is a widely spred myth about ProresHQ is for 2K stuff, but there is no relation between codecs and picture size.
Prores was designed to overcome the huge file size of the Uncompressed codecs.
BTW, with the actual price and speed of the storage system, a full Uncompressed workflow in SD is quire feasible. Few years ago that was reserved for rich people.