RE: [APML] "daylight" balanced lighting

["Richard Klappal" <klappal@xnet.com>]

Kodak's idea of 'daylight' is 5500K sunlight. (continuous spectrum, black
body radiation).  Fluorescent lights have discontinuous bands (Mercury
excitation at 405, 436, 546, 577, 579 nm, etc.)

I think that my computer monitor thinks 6500K is correct, but it looks
yellower than my earlier monitors.  Somewhere in my searches for calibration
info, some think "computer daylight" is around 9000K which would be, to my
mind, open shade, north light, no sunlight in the picture, only skylight.

For prints or slides, I think I'd tend to believe Kodak first.

Rich



-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Jason Ware
Sent: Tuesday, February 12, 2002 20:52
To: astro-photo@seds.org
Subject: [APML] "daylight" balanced lighting



I have two hp deisgnjet printers, one is a
"proofing" printer. The idea is to have this
printer's color balance match the large 5000PS
so I can do proofs on it first.

On a grey scale test image I notice that the
prints from one are slightly more magenta than
the other...when viewed under incandescent light.
On the other hand when viewed under florescent
light the exact opposite is true! I presume this
is because they use different ink sets, the
20PS proofing printer uses a consumer based ink
and the 5000PS uses a professional, more stable
ink set.

Anyway, I need to standardize on a viewing lighting.
I know there are "daylight" balanced florescent
lights...something like 5000K. Is there a standard
accepted lighting type for viewing and judging
photographic prints? Are the bulbs florescent or
incandescent?

Thanks!

--
 -Jason Ware

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