Can old tv shows be remastered for Blu-Ray (like Black Adder)?

I wrote that wrong. I know they can be plopped on Blu-Ray, but can Blu-ray look better than "remsatered DVDedictions olf old tv shows? ex.
I saw this posted here on the forums and it made me wonder…

If the shows were shot on film, they can look significantly better than the DVD versions.

But one thing I learned from the remastered Star Trek eps is that most of the make-up artists were never thinking about HD…