I export as TIFF in 601 color space and use 601 to bring it back. You do have to watch your levels and make sure you are working in a digital video color space of 16RGB to 235RGB instead of the usual graphics range of 0RGB to 255RGB.
If you play with levels in PhotoShop and you take black levels and make then 0RGB instead of 16RGB (for the blackest black) then you will want to import with the RGB setting. Same for white with the 235 to 255 issue.
