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- Newsgroups: comp.sys.next.misc
- Path: sparky!uunet!snorkelwacker.mit.edu!news.media.mit.edu!news
- From: wave@waits.media.mit.edu (Michael B. Johnson)
- Subject: Re: RenderMan-High resolution rendering?
- Message-ID: <1992Nov13.170817.4439@news.media.mit.edu>
- Sender: news@news.media.mit.edu (USENET News System)
- Organization: MIT Media Laboratory
- References: <BxLzx8.Fot@mentor.cc.purdue.edu>
- Date: Fri, 13 Nov 1992 17:08:17 GMT
- Lines: 96
-
- Allen B writes
- > In article <1992Nov12.050629.26616@news.media.mit.edu>
- wave@waits.media.mit.edu
- > (Michael B. Johnson) writes:
- > > Here's where you could change the resolution of your image from, say,
- 256x128
- > > to whatever you'd like (2048x2048?).
- >
- > Yeah, like most people have a use for a square print. I'd
- > try something like 2048 x 1536 or 4K x 3K.
-
- Geez, Allen, did you have too much coffee this morning? The number I typed
- above was a typo (clearly, since I was going from a 2:1 aspect ratio to a 1.:1)
- - but, yea, sure, I have a lot of use for square images. I shoot some 2 1/4,
- which is a square photographic format. If you do any icons (yea, I know, way
- low rez but) on the NeXT, they are square also Yes, I do use RenderMan to do
- icons. I model better than I draw). Lighten up. The world is not 4:3, or
- even 1.85:1.
-
- >
- > But from reading his posting, I was wondering whether
- > this works. I haven't tried to prman anything bigger than
- > the NeXT screen. Does it crap out at high resolutions?
- > qrman sure crashes a lot.
-
- prman is probably one of the most robust, well written pieces of software out
- there (especially in the rendering world). If you have the time and the swap
- space, it will make the picture. prman is the culmination of some of the
- brightest minds in computer graphics hacking away in a research and production
- environment for many years. qrman, on the other hand, is very, very new. It
- will get better, and clearly has a ways to go.
-
- >
- > > Also realize that PhotoCD is takes an analog image (film) and puts it in a
- > > digital form (5 varying resolution images on a CD-ROM). This is the
- opposite
- > > of what you're talking about doing, which is taking digital imagery and
- > putting
- > > it to an analog form. Kodak has yet to address this with PhotoCD (other
- than
- > > to say you could go to a photofinishing store and specify your reprints
- > there).
- >
- > The highest Photo-CD res I've heard is 4K x 3K. If you could
- > write your image digitally to a Photo-CD, that'd be quite
- > convenient. You'd then be able to do whatever Kodak comes
- > up with with your image.
- >
-
- I don't have the specs handy, but in the last few months, Kodak has announced
- (but not shipped, to my knowledge) a few new types of Photo-CD, the largest of
- which is intended for digital archiving of 4x5s. I would hope the resolution
- is higher than 4Kx3K, since the high res version of the 35mm consumer product
- is about 3Kx2K...
-
-
- > > Charlie - supress the urge to do things at 400dpi, unless you are doing
- > things
- > > that are only an inch or two wide. For rendering, think in pixels, not
- dpi.
- >
- > I disagree. You should take the requirements of your
- > print into account. I think Photo-CD aims way too low for
- > big things like magazine covers- and certainly for
- > posters.
-
- Photo-CD isn't aiming for posters, and for a lot of magazine covers, using
- images from a Photo-CD will be fine. Keep in mind, the Photo-CD that most
- people are talking about is the consumer product, not the pro one. Even so,
- have you seen the stuff from Kodak where they take the Ektar 25 negative that's
- been put on Photo-CD and then zoom it way up and use that as a 1/4 page color
- image? It looked pretty sweet to me...
-
-
- >
- > On the other hand. I think people often overestimate the
- > resolution they need. I've seen things produced for NTSC
- > used in print and as slides and they looked great. It
- > depends a lot on sampling and viewing conditions.
- >
- > Your best bet, of course, is to experiment. Anybody who
- > prints things will tell you there's nothing like seeing
- > it in print to tell you what it'll look like in print. Same
- > goes for film, video, whatever. If you can do a test print
- > (once you find a service), you'll learn more from that
- > than speculating.
- >
-
- Very sound advice.
-
- --
-
- --> Michael B. Johnson
- --> MIT Media Lab -- Computer Graphics & Animation Group
- --> (617) 253-0663 -- wave@media-lab.media.mit.edu
- --> NeXT Mail accepted at wave@nordine.media.mit.edu
-