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Author Topic: DLP problems
Tom Kroening
Expert Film Handler

Posts: 214
From: Janesville, WI USA
Registered: Oct 1999

 - posted 10-02-2000 06:00 PM      Profile for Tom Kroening   Email Tom Kroening   Send New Private Message       Edit/Delete Post 
I've kinda been thinking about DLP. I know an issue that we have right now is scratched and dirty prints. Now the way I understand it, movies will be digitized and then compressed. Does anyone know if this will be lossfull or lossless compression? If its lossfull compression then its still an imperfect medium, just like film. DLP could also be subject to frame rate drop due to data corruption (especially if read over and over from a cd like DTS). Im sure patrons wouldn't appreciate a jumpy movie!

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Scott Norwood
Film God

Posts: 8002
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99

 - posted 10-02-2000 06:20 PM      Profile for Scott Norwood   Author's Homepage   Email Scott Norwood   Send New Private Message       Edit/Delete Post 
It's definitely lossy compression.

The early DLP demos were run directly off of a D-5 videotape (HDTV-resolution, probably processed with extra edge-enhancement).

The Star Wars DLP shows were run off a 300 (?)-gig Pluto RAID array and were compressed at a fairly low ratio (no, I don't know what that was, but I didn't notice any compression artifacts).

The current DLP installations are using a Qubit hard-disk system and a standard feature-length movie takes up about 40gigs of space. This is pretty serious compression and the artifacts are very noticeable in some scenes and not at all noticeable in others. It's weird, though, since the picture "looks" sharp at first glance, but, after watching it for a while, it becomes obvious how much detail is really lacking.

I've posted this before, but in case anyone cares and has missed the earlier posts, I have some pictures and longish reviews here.

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Greg Mueller
Phenomenal Film Handler

Posts: 1687
From: Port Gamble, WA
Registered: Jun 99

 - posted 10-03-2000 09:20 AM      Profile for Greg Mueller   Author's Homepage   Email Greg Mueller   Send New Private Message       Edit/Delete Post 
"pretty serious compression and the artifacts are very noticeable"
"it becomes obvious how much detail is really lacking."


Greg Mueller
Amateur Astronomer, Machinist, Filmnut

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