Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!shelby!helens!baroque!jim From: jim@baroque.Stanford.EDU (unknown) Newsgroups: comp.graphics Subject: digitizing images (was Re: Scientific Visualization again) Message-ID: Date: 27 Nov 89 21:47:51 GMT References: <11726@phoenix.Princeton.EDU> <1989Nov25.142552.1702@hellgate.utah.edu> <3399@jhunix.HCF.JHU.EDU> <5646@eos.UUCP> <1989Nov27.024857.9480@ux1.cso.uiuc.edu> Sender: news@helens.STANFORD.EDU Organization: Stanford University Lines: 21 In-reply-to: mcdonald@aries.uiuc.edu's message of 27 Nov 89 02:48:57 GMT Most desktop scanners are very low resolution. There are some newer devices which use a camera to capture an image off of a 35mm slide, but I doubt that they can give 256 to 1024 gray levels and certainly not 2048x2048 pixels at a single go. The only device I know of which meets your needs is a scanning microdensitometer which digitizes a negative by moving it around in front of a focused light source with the transmission measured by a PMT tube. Filters can be used for scanning color negatives. Different aperature shapes and sizes are used to control the resolution and pixel shape. I don't know what the overall price range is, but ours, granite slabs, computer interface and all cost around $200K a few years ago when we bought it from a company now owned by Perkin-Elmer. These beasts can produce 12bit images of almost arbitrary resolution Jim Helman Department of Applied Physics P.O. Box 10494 Stanford University Stanford, CA 94309 (jim@thrush.stanford.edu) (415) 723-4940 Brought to you by Super Global Mega Corp .com