Re: filmscanners: Best digital archive medium for scans?

[Winsor Crosby <wincros@earthlink.net>]

Could you not combine the scanned black and white separations as 
layers in PhotoShop? Don't astronomers do that sort of thing all the 
time?

>Before CD-R came along, I was advocating people use separations for 
>Wedding Photos, and other similarly precious images. However, I was 
>taken to task on that on the grounds that reproducing color images 
>from separations is quite expensive. I have no reason to doubt that 
>iut is inmappropriate as a general archive, just to be used for the 
>irreplaceable family treasures.
>Hersch
>
>At 10:19 AM 08/07/2001, you wrote:
>
>>>Hersch wrote:
>>>
>>>>He [Mark] wants 20 years. My 20-year-old slides and negatives 
>>>>have degraded enough that they need Ed's roc, and are generally 
>>>>not as 'good as new.' I think the digital resource is more 
>>>>reliable, if proper care and storage, and regular renewal are 
>>>>carried out.
>>>>
>>>
>>>It needs to be mentioned that not all 20-year-old film is equal 
>>>(we all know the principles, but we don't often encounter the 
>>>examples head-to-head). :-)
>>>
>>>If film is stored in a cool, dark, humidity-controled environment, 
>>>its lifetime is very good over a period of 100-years or 
>>>so--providing that the film base and chemicals were "archiveable" 
>>>in the first place (and not all were). Some of my mother's slides 
>>>are 52 years old--only a few of them are degraded: some by obvious 
>>>light exposure, some by dust, a very few just faded (poor dyes or 
>>>development).
>>>
>>>But both Hersch and Maris are right. Film is stable, and so are 
>>>digital numbers; the problem being that *nothing* is really 
>>>permanent, so continuous and redundant archiving, at this point in 
>>>time, is the safest way to approach this problem.
>>>
>>>Best regards--LRA
>>>
>>
>>It is not wide spread, but photographers have archived color images 
>>as black and white color separations for years.  The longevity of 
>>black and white film is pretty well established.
>>--
>>Winsor Crosby
>>Long Beach, California

-- 
Winsor Crosby
Long Beach, California