Re: colorsync-users digest, Vol 3 #195 - 2 msgs
Re: colorsync-users digest, Vol 3 #195 - 2 msgs
- Subject: Re: colorsync-users digest, Vol 3 #195 - 2 msgs
- From: Joseph Castay <email@hidden>
- Date: Sun, 05 May 2002 21:06:22 -0400
>
> in the case of cameras a
>
> profile is environment specific, in or out of the studio. This means you
>
> can have 1 really great 5000K general profile for day or strobe (a tough
>
> one). Or a specific profile for each environment (better).
>
>
I would have to disagree with this entirely. The difference between shooting
>
under 5000k studio light and shooting outdoors is gray balance. By gray
>
balancing for each lighting condition you are 3relinearizing2 the camera to
>
function with your one profile. Profiling scenes is problematic because of
>
outside influences (color) reflected onto the target or uneven lighting. A
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good profile requires the target be lit with great care so the comparison
>
between data and patches is not subject to scene specific shifts. A great
>
many of the problems being reported about profiles not working are most
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likely related to the care in which they are made. Profiling scenes is a
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silly idea that should stop being promoted. All it does is make for bad
>
results and does nothing to further the craft of building and using
>
profiles.
>
My reason for using 5000K is for a familiar point of reference, pick a Temp
(inside or out) that works best for you. If you use 2 - 10,000 lights and
use one gray balance what might happen. What you are suggesting is that all
the light is mix together creating one environment (bucket). One gray
reference point (card, round ball, or what ever) strategically lit and
placed in a well balance scene. This could happen.
Let us take the above, except for one light source, it is not influencing
the gray reference point, but it is in the scene. Depending on its
strength/influence, you may see a cast because it is not represented at the
gray reference point. The cast may even be weak and you do not care or it
may be too strong and you do care. How do you balance the cast? The easiest
way is to filter the light that is creating the cast, the old fashion way.
The question as I took it, was a concern with color cast. Can a profile rid
you of the cast? How do you compensate for a color cast? Let us add 3
digital cameras producing different results. Lets add at least 2 different
strobe manufacturers. What the heck lets just mix them at any give moment.
As far as creating a profile for every environment: I do not think it I so
silly. It is not always necessary. Sometimes one good general profile will
do what you need it to do. Like anything else, you need to pay attention
what you are doing when creating profiles (all). You are likely to get a
reflection in "just about" any environment. Sometimes you may want a solid
reference point, not to profile, but to get the best gray balance possible.
There are times when you want an evening lit cast; a gray balance would
color correct the evening cast to a neutral. However, if you are using a
strobe as your main under the same evening light you may want to gray
balance the strobe, the evening light in the background will still be as it
is. Do you need a profile for strobe; no, you do not. Gray balance is all
you need. However, what if you want to optimize the color recorded from the
strobe light and the CCD. A profile could do that. On the job this may not
produce the best profile, but could you create a good profile for that
strobe; yes you can, and use it when ever you wish.
And a great profile and a bad profile are used in the same manner. They both
are at work. The craft of building a great profile depends most on the
crafty creators capability to cook. A good cook will tell you it is all in
the preparation.
Now you can create a profile with the "whatever" light source before hand in
a wonderfully control environment. Then use the profile time and time again,
no matter where you are doing. This is now called a "general profile". And
most manufacturers provide general profiles that are created in controlled
environments (I would think). So why profile any camera, why all you have
to do is gray balance. In addition, you do not need to color correct for
cast or contrast, etc.
Joseph
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