Message-Id: <mailto:199412142149.PAA20752@library.wustl.edu> Date: Wed, 14 Dec 1994 16:49:51 -0500 From: Pamela Mason <mailto:pmason@NALUSDA.GOV> Subject: Re: UNM Hlth Sci Cntr Library To: Multiple recipients of list IMAGELIB
On Wed, 14 Dec 1994, Lisa kindrick wrote:>
> Dear Pamela:
>
> Thank you for sharing your expertise with us regarding
> our imaging project. We are scanning color photographs
> (continuous tone), black and white photos, and color slides.
> The color photos would be scanned using the 256 colors option and
> saved as a TIFF file. Sorry, I'm not sure about the
> answer to your 8-bit, 24-bit, etc. question. I'm really a
> novice at this, but learning by the day. Thanks again for
> your help.
>
> Lisa Kindrick
> Systems Librarian
> University of New Mexico Health Sciences Center Library
> mailto:lkindric@biblio.unm.edu
>
Lisa, If you're scanning the images at 256 colors that is the same as 8-bit color. You can save them as TIFF files, compressed. Use a lossless compression if you do this, like LZW. Although, by scanning at 256 colors you're already losing color information from the original. You might consider scanning the photos at a higher color level such as 24-bit, which would capture more information. 8-bit is pretty minimal and certainly not archival quality, if that is what your project is about. For the color slides, I would certainly scan at 24-bit color. That is, for instance, what Kodak PhotoCD is. Black and white photos are considered grayscale (I had thought you were talking about black and white text pages, which is a whole different matter). For grayscale scanning, 256 levels of gray would probably be ok, although many are recommending higher levels. The idea is not to do scanning more than once. Do it once at the highest level you can, store it, then you can distribute a lower level image which is a smaller file size. Best, Pamela *ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ* | Pamela Mason, Project Manager | National Agricultural Library |
| mailto:pmason@nalusda.gov | Information Systems Division |
| Phone: (301) 504-6813 | 10301 Baltimore Blvd. |
| Phone: (301) 504-7473 | Beltsville, MD 20705-2351 |
*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*ÿ*