Originally Posted by Gary J
Nobody said they were rubbish. Perhaps some remedial reading is in order.
The idea is de-interlacing a scaled image can not look as good and will probably look worse than using 480i into the VP as Josh says. Are you starting to get it now?
I'll be patient...
Okay, read what you've just quoted:
Note that the deinterlacing by EDGE is not going to fix any bad deinterlacing that was done downstream (i.e. PReP) because there was also a scaling step which can't be undone.
Note the term 'bad deinterlacing'. Now take an example where there isn't poor deinterlacing done downstream, but in fact just good scaling.
What Dale, and Josh, are stating is that PReP cannot undo poor deinterlacing if scaling has since occurred because you cannot recreate the original fields from an upscaled input (i.e. 1080p). This was stated as a reason PReP is not enabled for 1080p inputs.
What the rest of us are talking about is that you can get a fantastic picture from a scaled interlaced input. What's required is that the source that is upscaling does not do a poor job of deinterlacing. This doesn't even involve PReP, as EDGE will be processing an interlaced input.
In my example, the source outputs 480i/576i to an HDP which upscales (fantastically) to 1080i. This interlaced output is then fed into EDGE, which then deinterlaces the signal and does all the other fancy processing. As far as EDGE is concerned it is getting a proper 1080i signal, and treating it as so.
If that isn't any clearer now, I just give up.