Re: CMOS or CCD on digital camera ?
From: Chris L Peterson (clp_at_alumni.caltech.edu)
Date: 12/23/04
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Date: Thu, 23 Dec 2004 04:07:48 GMT
On Thu, 23 Dec 2004 02:09:18 GMT, "Michael Toms" <michaT@telusplanet.net> wrote:
>What about standard film B&W SLR pics. Can one use a filter wheel
>on three separate shots and combine them after scanning them? Is there
>a way to combine scanned pictures that are infact digitized?
Absolutely. The very best film astroimages are made just this way. Color film
has the same sort of problems that color sensors have-poor control of the
passbands and poor performance with narrow band sources. The fix is to control
the spectral response externally with accurate filters. Take separate images
through (nominally) red, green, and blue filters. These can be combined by most
image processing software. For instance, in Photoshop, you would paste the three
B&W images separately into the red, green, and blue channels of a new image.
Voila- color.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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