Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!brutus.cs.uiuc.edu!rpi!rpi.edu!rodney From: rodney@sun.ipl.rpi.edu (Rodney Peck II) Newsgroups: comp.graphics Subject: Re: digitizing images (was Re: Scientific Visualization again) Message-ID: Date: 28 Nov 89 06:58:53 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> Organization: Rensselaer Polytechnic Institute Image Processing Lab, Troy NY Lines: 30 In-Reply-To: jim@baroque.Stanford.EDU's message of 27 Nov 89 21:47:51 GMT >>>>> On 27 Nov 89 21:47:51 GMT, jim@baroque.Stanford.EDU (unknown) said: jim> Most desktop scanners are very low resolution. There are some newer jim> devices which use a camera to capture an image off of a 35mm slide, jim> but I doubt that they can give 256 to 1024 gray levels and certainly not jim> 2048x2048 pixels at a single go. jim> The only device I know of which meets your needs is a scanning jim> microdensitometer which digitizes a negative by moving it around in jim> front of a focused light source with the transmission measured by a jim> PMT tube. Filters can be used for scanning color negatives. jim> Different aperature shapes and sizes are used to control the jim> resolution and pixel shape. jim> I don't know what the overall price range is, but ours, granite slabs, jim> computer interface and all cost around $200K a few years ago when we jim> bought it from a company now owned by Perkin-Elmer. These beasts can jim> produce 12bit images of almost arbitrary resolution We just bought a slide scanner from microtex (I think) which does 4096x4096 in 24 bit color (that's 8 per rgb channel) for $8,000. It will of course, do 4096x4096 by 256 level gray as well. It's not fast, but high res scanners never are. Send me mail and I'll see what sort of information I can find. $200K is far too much money to pay for grayscale digitizing these days. -- Rodney Brought to you by Super Global Mega Corp .com