This is a good article on the basic issues on scaling up footage for high-definition video. Goes over frame resolution, pixel aspect ratio, and interlace. One good tidbit mentions an advantage to using Compressor with interlaced footage:
On the other hand, when converting from interlaced DV to progressive HD, deinterlacing is a huge component of the quality equation, which could and perhaps should change your workflow, particularly for Final Cut Pro editors. That’s because Final Cut Pro deploys different deinterlacing algorithms than Compressor, which uses the glacial but ultra-high quality Optical Flow algorithm from Shake. If converting from interlaced source to progressive, you may produce noticeably better quality by scaling and particularly deinterlacing in Compressor. This means creating a separate sequence for your SD footage, rendering it out through Compressor, then re-importing the file back into Final Cut Pro. On the other hand, I found scaling quality relatively close between Final Cut Pro and Compressor, so if you don’t need to de-interlace, scaling in Final Cut Pro should work just fine.
This article says that FCP and Compressor do an equivalent job of scaling-up video. But early this year I wrote about a tip for getting better-quality uprez with Photoshop. A tricky workflow, but if quality really matters then it's doable.
[via FreshDV]
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