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Different lighting conditions
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Antonio  
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 More options Jun 14, 12:57 pm
From: Antonio <ans...@gmail.com>
Date: Sun, 14 Jun 2009 09:57:49 -0700 (PDT)
Local: Sun, Jun 14 2009 12:57 pm
Subject: Different lighting conditions
In order to have even lighting, and following the AcrCalibrator
recommendations, I created the camera profile with AcrCalibrator with
two identical 5300k studio lights at 45 degrees.

I read that this calibration should be also valid for other studio
lighting arrangements.

Is this the case even if the lighting is very different (like just one
light, or four, or combination of soft boxes and open lights. etc) but
always using the same 5300k heads?

Is it truly good enough even for outdoors lighting?

Thanks,

Antonio


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steve sprengel  
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 More options Jun 14, 2:55 pm
From: steve sprengel <steve.spren...@gmail.com>
Date: Sun, 14 Jun 2009 13:55:42 -0500
Local: Sun, Jun 14 2009 2:55 pm
Subject: Re: [acrcal] Different lighting conditions

If the color of the lighting is the same in these situations then the
profile should be valid.  The light-modifiers may have a slight cast, and
the surroundings may reflect different colors.

The instructions about having two lights at 45-degress has to do with having
even lighting on the CC, because a gradient or vignetting can confuse the
profile-calculation process.

Back when I was using the script, I shoot the CC in several different
lighting situations, and put the color-temp and tint in the profile name so
I could choose the right one based on the WB of a particualr image.  My
suite of calibrations had Incandescent, Fluorescent, Daylight, Cloudy,
Shade, Sunset, Twilight, Sodium Vapor, as well as a few specialized ones
like Sunny-Behind-the-House for shooting flowerrs in the garden because my
house has a large red-brick wall and pale-blue upper-story that give some
color-cast to anything I shoot in the garden if the sun is more on the house
than the flowers, so I wanted to correct for that particular environmental
situation.

Now with the DNG Profile Editor, I create a dual-color script that has
Incandescent and Daylight profiles and so ACR or Lightroom can interplation
between them.  I still have spearate profiles for extreme situations such as
the mercury vapor arena lighting or sunset or twilight, but can get buy with
my single dual-color-table profile for most outdoor and indoor photos.


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Antonio  
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 More options Jun 16, 12:12 pm
From: Antonio <ans...@gmail.com>
Date: Tue, 16 Jun 2009 09:12:55 -0700 (PDT)
Local: Tues, Jun 16 2009 12:12 pm
Subject: Re: Different lighting conditions
hello Steve,

Thank you for your very informative response.

It makes good sense and it helps me clarify the underlying principles.

I don't know how to creat a dual color table profile, but will
research on it before I ask further.

Kind regards,

Antonio

On Jun 14, 7:55 pm, steve sprengel <steve.spren...@gmail.com> wrote:


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