olson@vixvax.mgi.com (Thor Olson) (05/22/91)
In our lab we would like to become better equipped to measure the visible spectral response of photographic film, filters, and other computer graphics related materials. Currently, the graphic arts world specifies color by densitometer readings. These provide a three point weighted sample of the spectrum. I would like to examine the spectrum with a much finer sample interval, say 1-2 nm. What recommendations for spectrophotometers can you make? I am interested in what you think makes a good one in terms of accuracy, resolution, repeatability and cost, of course, but also the ease of use, flexibility with samples and light sources, speed of operation, ability to connect with my computer, etc. Different applications will certainly be looking for different things in such an instrument. I have found it difficult to find this type of information for equipment I know must exist. Post to this group, or e-mail to me and I will gather and collate the responses. +------------------------------------------------------------- | Thor Olson, Film Recorder Czar | | | Management Graphics Inc | E-mail: olson@mgi.com | | 1401 E 79 St | Voice: +1 612/851-6108 | | Minneapolis MN 55425 USA | Fax: +1 612/854-6913 | +------------------------------------------------------------- "Everyone can perform magic, everyone can reach his goal, if he can think, wait, and fast." -Siddhartha to Kamala
dan@rna.UUCP (Dan Ts'o) (05/24/91)
In article <1991May22.092634.984@vixvax.mgi.com> olson@vixvax.mgi.com (Thor Olson) writes: >I would like to examine the spectrum with a much finer sample interval, >say 1-2 nm. What recommendations for spectrophotometers can you >make? I am interested in what you think makes a good one in terms >of accuracy, resolution, repeatability and cost, of course, but >also the ease of use, flexibility with samples and light sources, >speed of operation, ability to connect with my computer, etc. The company to get a spectrophotometer from is Photo Research. They have, among other things, a 2nm model, for $25,000. It is best used with a PC. Cheers, Dan Ts'o 212-570-7671 Dept. Neurobiology dan@rna.rockefeller.edu Rockefeller Univ. ...phri!rna!dan 1230 York Ave. tso@rockvax.bitnet NY, NY 10021
larry@kitty.UUCP (Larry Lippman) (05/26/91)
In article <1991May22.092634.984@vixvax.mgi.com> olson@vixvax.mgi.com (Thor Olson) writes: >In our lab we would like to become better equipped to measure >the visible spectral response of photographic film, filters, and >other computer graphics related materials. Currently, the graphic >arts world specifies color by densitometer readings. These provide >a three point weighted sample of the spectrum. > >I would like to examine the spectrum with a much finer sample interval, >say 1-2 nm. What recommendations for spectrophotometers can you >make? I am interested in what you think makes a good one in terms >of accuracy, resolution, repeatability and cost, of course, but >also the ease of use, flexibility with samples and light sources, >speed of operation, ability to connect with my computer, etc. > >Different applications will certainly be looking for >different things in such an instrument. I have found it difficult >to find this type of information for equipment I know must exist. Since your application is photographic and graphic arts in nature, my first recommendation is to contact Macbeth, a division of Kollmorgen Corp. located in Baltimore, MD. Macbeth mades a wide variety of spectrophotometers for both transmission and reflectance application. Macbeth products are available which display and plot true spectrophotometric data (i.e., in nm), in addition to providing data representation for the graphic arts, CIE and Munsell color world. Since you may require correlation of spectrophotometric data to pigment mixing, CIE and/or Munsell representations, Macbeth is probably your best choice since they understand all of these worlds. Something on the order of a Macbeth Series 1500 Color Measurement System will resolve to a few nm with no problem. For better accuracy and sophistication (like variable bandpass, scanning, etc.) you could consider products manufactured by SLM/Aminco. However, you should be forwarned that SLM does not deal with hue, chroma, value and any aspect of the CIE and Munsell world - all you get is energy -vs- wavelength. Larry Lippman @ Recognition Research Corp. "Have you hugged your cat today?" VOICE: 716/688-1231 {boulder, rutgers, watmath}!ub!kitty!larry FAX: 716/741-9635 [note: ub=acsu.buffalo.edu] uunet!/ \aerion!larry