Re: Photo Filtration

de Susan Bugher 01/19/2007 04:38

Richard Steinfeld wrote:

> I'm looking for an image correction program (or part of a program) that
> will compensate for the discontinuous light spectrum of fluorescent
> lamps.
>
> I've been successful in illuminating still subjects for technical
> documentation using compact fluorescent bulbs, except that unlike
> incandescent bulbs, no matter what the claims have been for these
> compacts, their light output has a jagged color curve similar to standard
> fluorescent bulbs. The photos look weird and slightly sick -- not as bad
> as the long tubes put out, but still, the photos are unacceptable. I've
> not been able to adjust them properly using the normal controls in
> IrfanView, which are typical of other image programs I've used.

Lots of good info about color correction on this site:

A few scanning tips by Wayne Fulton
http://www.scantips.com/

and this tidbit re fluorescent lamps:

http://www.scantips.com/faq1.html

<q>
Older scanners used replaceable lamps, typically larger 1/2 inch (12 mm)
diameter lamps. These are special lamps having high CRI ( Color
Rendering Index). CRI is a measure of color purity, and CRI of 70 to 85
is good for scanners. The scanner company's Customer Service Dept
probably sells replacement lamps, at least they used to when these
scanners were sold. I'd suggest you should phone them first. Otherwise,
these high CRI lamps are difficult to find, it will probably have to be
a specialty lamp shop (perhaps try here or here).
</q>

Susan
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