Re: CM challenge for an architectural photographer
Re: CM challenge for an architectural photographer
- Subject: Re: CM challenge for an architectural photographer
- From: Robin Myers <email@hidden>
- Date: Wed, 15 Dec 2004 19:00:44 -0800
On 15 Dec 2004, at 09:41, email@hidden wrote:
if you shoot digitally or with film - would it be a good idea to
expose a chart and generate a profile for achieving correct color of
the walls (as the original post was concerned with) under those
lighting conditions ?
certainly more work and should be compensated for, but theoretically
would that work ?
The problem with this scenario is that you have several possibly
different reproduction requirements. By exposing a test chart and
trying to reproduce the scene you may be able to create a colorimetric
match, but it will probably not look like the actual room. The reason
is that the colors the observer senses in a room are a complex blend of
the paint on the wall, the texture of the wall (yes, this can alter the
color), the blend of illuminants (the interior lights, the filtered
sunlight coming through the windows and skylights, and any additional
lighting added by the photographer), and the light reflected from the
floors and furnishings off the walls will effect the wall color. If the
floor is brightly colored, I can guarantee you will see some of this
color reflected from the walls. This is why the professional
architectural rendering software goes through very complex ray tracing,
radiosity and other computations for each pixel in their renderings.
Remember, the color of the daylight will change during the day, so the
best you can try is to get it right for a particular time. The choice
of test chart illumination (room, window, photographic) will also alter
the profile, so this can be a problem.
Oh, and do not forget the metamerism failure we are all used to with
the final print. Where is the client going to view the printed image?
What type of lighting, surround, illumination level, ...
If I were approaching this project and the goal was to reproduce the
observer's view of the room as accurately as possible, I would profile
the camera for noon daylight illumination, but I would take spectral
readings of the important objects in the room (floors, walls,
furnishings) from the camera's viewpoint with a telespectrophotometer.
This is a spectrophotometer that can measure spectra at a distance. I
would use the spectral readings to adjust the camera's image to make
certain the colors were accurate to the perceived scene.
Good luck on this one!
Robin Myers
www.rmimaging.com
Maker of SpectraShop, THE spectral analysis program.
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