Re: Outdoor/daylight camera profile
Re: Outdoor/daylight camera profile
- Subject: Re: Outdoor/daylight camera profile
- From: <email@hidden>
- Date: Tue, 23 May 2006 21:23:47 -0400
Michael,
Here are some thoughts I had about your answers.
So I want to see the color of the daylight in
the images as it changes. For
example, I don't want the golden light of sunset to be
neutralized. So, for
those purposes, I would think that I'd make a single
profile at mid-day when
my color meter reads 5500K.
OK.
All shots taken, whether morning, noon, or
night, could be white balanced to 5500K and the daylight
profile applied.
This should render sunsets yellow, etc.
I would not mix White Balance (WB) and profile correction.
I would do one or the other. WB will make your golden
white look the white of the selected color space (ex.: D65
for Adobe), change all other colors accordingly, and you
will loose your artistic intent. Applying the profile on
top will only re-enforce the correction to 5500 K.
Obviously, early morning and late afternoon light has
different
characteristics than mid-day light. So applying a
mid-day profile to late
afternoon images will make them appear yellow, as they
should, but also may
not properly display the color saturation, etc. For
example, I have no idea
- just guessing - but perhaps some colors show more
saturation in yellow
light than others.
I could see a possibility for increased saturation in
metameric colors. If you obtain increased saturation due
to the late afternoon light, the saturation should stay
once profiled to another light (since the converting
algorithm is not based on the spectral information, just
the color coordinates).
So, I'm wondering if it makes sense to make a profile
using afternoon light
but color balance the image for mid-day. The idea being
to more closely
capture the color response to afternoon light, yet still
show that the light
is yellow. The scenario would be the following:
-- shoot the color checker in later afternoon light
-- white balance the color checker shot
-- run the profiler and save as "...afternoon..xxx.icc"
-- then take your real afternoon photo and apply the
afternoon profile but
white balance the real photo for 5500K.
As mentioned above, i would not mix the two techniques.
For my quickie/experiment, I placed the colorchecker at
45 degrees to the
sun (with the camera pointed straight at the target).
The intent was to
minimize reflections, much like copy work.
Placing the target 90 or more
degrees from the direct would mean indirect lighting by
the blue sky only.
I am not used to pure blue skies (!!!), so in my mind
there was cloud reflection also... and around noon, the
sun is quite high and will hit the target even if turned
90 degrees... but you would generally prefer to have the
sun behind you... and your 45 degrees is a good
compromise!
Danny
email@hidden
www.BabelColor.com
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