DVCpro HD dubs

[Sean Oneil]

That’s cool, but the term “lossless” has a very specific meaning, and even a .01% variance doesn’t cut it. I’d also argue that looking at scopes will not detect some aspects of loss especially if the chroma and luma levels stay exactly the same. Using the difference filter in AE or Photoshop is probably the best way to test if something is truly lossless.

It’s fair to say that SDI dubbing is “virtually lossless” and that in a real life workflow it’s just as good. I’m not criticizing the practice at all. I’m just saying it isn’t lossless. I do all my work in ProRes now which isn’t lossless either.

Sean