museum photos

Anita Cholewa anita at MOZART.CBS.UMN.EDU
Fri Feb 14 10:21:02 CST 1997


FYI, here's what I've found so far regarding biological
specimens and image scanning.

There is a problem with exposure to light to all biological
collections but this is dependent on length of exposure and
intensity of the light (not to exceed 200 lux/hrs) and
whether or not there is a filter to prevent IR/UV light.
There does appear to be some color changes in tissues
exposed to scanner and photocopying lights.  The question
is what is the minimum exposure--unknown.  One thing that
was interesting is that photocopying lights are more
intense than the flat image scanners and that flat image
scanners can have IR/UV filters but photocopiers don't.

Another comment that came through was that there can be
some loss of specimen parts simply through the physical
handling and the necessity of having to turn many speicmen
upside down to be scanned.

Will keep you all informed as I find out more info.

ANITA
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
                                       / \   /_ _  /                          |
                          _ _         /   \ /     /                           |
                         | \  \      / \   /_ _  /                            |
                         | _\/ \    /   \ /     /                             |
                          \  \/ \   \    /_ _  /                              |
Anita F. Cholewa, Ph.D.    \ _\/ \   \  /     /                               |
Director / UM Herbarium     \ _\  \   //- - -                                 |
Dept. of Plant Biology       \__\/   //  _  _          Please  Visit          |
1445 Gortner Ave.                \\ //__( )( )              Our               |
University of Minnesota           \//    (_)             Web Site:            |
St Paul,  MN  55108               ||                                          |
  612-625-0215                    ||     http://biosci.cbs.umn.edu/herbarium  |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|




More information about the Taxacom mailing list