There are two things about archive images at least I can think of this moment:
1. the resolution: diff size/materials require different resolution. There is no one-size-fit-all. To make a judgment, I would like to know the image (color?), the size of the material?, 
2. the file format: TIFF is the recommended format due to its openness, stability, and lossless data over the time. If you believe that your jpeg file has enough resolution, I do not see any problem to convert it to tiff. 

Yan

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From: Code for Libraries [[log in to unmask]] On Behalf Of Deng, Sai [[log in to unmask]]
Sent: Thursday, June 18, 2009 7:33 AM
To: [log in to unmask]
Subject: [CODE4LIB] Digital imaging questions

Hi, list,



A while ago, I read some interesting discussion on how to use camera to produce archival-quality images from this list. Now, I have some imaging questions and I think this might be a good list to turn to. Thank you in advance! We are trying to add some herbarium images to our DSpace. The specimen pictures will be taken at the Biology department and the library is responsible for depositing the images and transferring/mapping/adding metadata. On the testing stage, they use Fujifilm FinePix S8000fd digital camera

(http://www.fujifilmusa.com/support/ServiceSupportSoftwareContent.do?dbid=874716&prodcat=871639&sscucatid=664260). It produces 8 megapixel images, and it doesn't have raw/tiff support. It seems that it cannot produce archival quality images. Before we persuade the Biology department to switch their camera, I want to make sure it is absolutely necessary. The pictures they took look fine with human eyes, see an example at: http://library.wichita.edu/techserv/test/herbarium/Astenophylla1-02710.jpg

In order to make master images from a camera, it should be capable of producing raw or tiff images with 12 or above megapixels?



A related archiving question, the biology field standard is DarwinCore, however, DSpace doesn't support it. The Biology Dept. already has some data in spreadsheet. In this case, when it is impossible to map all the elements to Dublin Core, is it a good practice for us to set up several local elements mapped from DarwinCore?

Thanks a million,

Sai


Sai Deng
Metadata Catalog Librarian
Wichita State University Libraries
1845 Fairmount
Wichita, KS 67260-0068
Phone: (316) 978-5138
Fax:       (316) 978-3048
Email: [log in to unmask]
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