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8 messages in edu.ku.nhm.mailman.taxacomdigital images of type specimens| From | Sent On | Attachments |
|---|---|---|
| Bruce Neill | Aug 22, 1995 10:48 am | |
| Shawn Landry (BIO) | Aug 22, 1995 10:53 am | |
| Doug Yanega | Aug 22, 1995 11:01 am | |
| Peter Rauch | Aug 22, 1995 9:24 pm | |
| LINGAFELTER STEVEN WAYNE | Aug 22, 1995 10:22 pm | |
| Peter Rauch | Aug 23, 1995 10:13 am | |
| Curtis Clark | Aug 25, 1995 8:28 pm | |
| Shawn Landry (BIO) | Aug 28, 1995 10:04 am |
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| Subject: | digital images of type specimens | Actions... |
|---|---|---|
| From: | Bruce Neill (bne...@LCLARK.EDU) | |
| Date: | Aug 22, 1995 10:48:14 am | |
| List: | edu.ku.nhm.mailman.taxacom | |
At 10:53 8/22/95, Shawn Landry (BIO) wrote:
Please let me know if this is a repeat of a previous thread...
I am looking into the various techniques to take digital images of type specimens and would like to speak with anyone else involved with the issue. I am in need of specific product info as well as information regarding the best (or most appropriate) techniques. Specifically, I would like to hear from people who have compared the use of a digital camera with that of a video camera and video capture technique and/or scanning of 35mm slides.
The main conflict (as usual) is between resolution and affordability and usefulness of the images to the scientific community.
thanks, shawn
------------------------------------------------------------------------------ Shawn Landry Landry at chuma.cas.usf.edu Dept. of Biology LIF 136 (813) 899-0989 University of South Florida Tampa, FL 33620-5150
______________________________________________________________________________
Shawn:
I have been using video captures to create images from specimens under dissecting microscopes. It has worked quite well, but the resolution is not as good as it might be from scanning 35mm slides. It is also not as good as digital. I compared images from digital and video capture and found the digital to have abit more contrast. The difference was not worth the hassle of the digital camera over video (the capturing process was much faster on video and I was capturing a large number of specimens for analysis). If I understand the technology correctly, the digital will always yield better resolution than a video capture given hardware of roughly equal capacity. The inherent problem of video is in freezing a single frame - much like the pause on a VCR. I cannot comment on the relative abilities of digital vs. 35mm. I think that Doug Yanega is absolutley correct about the weak link being the printing process (for a reasonable amount of money).
We have been using NIH Image to capture video images. The software works very well and greatly facilitates making quantitative measurements on small specimens. Image is a public domain program for Macs. I do not know whether it is available for PCs.
I would love to hear any infromation you might gather during this investigation of image capturing techniques, as I would like to get more resolution than I am getting now with minimal expenditures.
Bruce Neill