Slowing down footage, before or after rotoscoping?

Ok, quick question, I have parts of my film where I slow the footage down to 75% or 50% depending. What I was wondering is, would it be better to rotoscope the lightsabres in then slow the footage down, or the other way round?

Only reason I'm asking, is I'm doing all the rotoscoping myself, and I'm trying to cut the workload down as much as possible, without loosing quailty, obviously if I slowed the footage down I would have sometimes twice as many frames to rotoscope.

What does everybody else do?

Thanks in advance,

Zarbid

P.S Using AE to rotoscope and premiere to edit/slow down footage

 

You rotoscope the slowed footage. Ideally, you'll only ever want to use 50% for slow motion. Using 75% will produce wierd frame blending artifacts.

-Spiff

 

the clip that will be slowed down, you should rotoscope it first i think, then export it uncompressed, so you don't loose quality, and then slow it down.

 

No. You will want to slow it down first before rotoscoping or the frame blending will be obvious from the lightsabers.

 

I'd be inclined to use virtualdub to deinterlace the footage and double the frame rate (100fps.com will tell you how). Then you can halve the speed of the resulting clip and rotoscope that.