RE: [APML] Photoshop questions

["Lane, Jason R" <jason.lane@navy.mil>]

Hi Dale,

6500K is a color temperature typically associated with bright natural light...like with overcast or the sun during clear noon summer skies.  Skylight has a color temperature of about 12000K to 18000K (bluer), while flourescent bulbs are around 4000K.  Incandescent 100W bulb has a color temperature of 2900K.  6500K is also very close to the center of the CIE 1931 Chromaticity chart (measure of RGB colors).

The reason they say 6500K is the best for color matching is that the typical picture is taken under sunlight conditions with film balanced for that.  If you also assume that you would be viewing your picture in daylight conditions, then you would want to perform color balancing on the scan with your monitor set at 6500K.  If you were going to present the pictures on the web, you would set your monitor at the default setting (9300K).

I'm with you, though..I just set my monitor to 6500K and it appears way too red.  It looks redder than flourescent lights at my desk.  I guess it's something you have to get used to.

-Jason

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Dale Ireland
Sent: Sunday, July 04, 2004 1:44 PM
To: APML (APML)
Subject: [APML] Photoshop questions


Hi
Photoshop questions

1: What is the point of having the working space set to Adobe RGB 1998 if my
monitor will only display the monitor profile. I have all the RGBxy and
white point values custom set for the monitor. If I set it to Adobe RGB 1998
don't I risk producing colors that I can't see or adjust on my monitor but
will appear in a print?

2: My NEC monitor has an "sRGB" setting at 6500K which controls contrast and
brightness as well as display colors. This setting appears somewhat flat,
whites aren't crisp. It isn't what I would pick to view images or surf the
web but it is supposed to be the best for color matching. Does any use or
know more about this display option?

3: If I select the my scanner's Epson4870 profile as the Photoshop working
space in the Photoshop color preferences all images look darker. I don't
understand the point of having a profile for an input device, I thought it
is just for matching the monitor image to output prints or images. What is
the point of having a working space scanner profile? I am obviously missing
something.

Dale


_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo