On 11 Aug, 2005, at 08:04, Roberto Michelena wrote:
I was looking at the DTP70 specs, a couple of things grabbed my
attention:
- it says it has selectable white/black backing (as the DTP41 I
guess); is
thos a physical lever to move, or software controlled? Is this the
"old"
white of the DTP41, or the "enhanced" white tile that was later made
available?
- it also says that it has selectable UV cut for the light source!
Great,
two instruments in one! Manual of software controlled?
- the light source is 2800K color; so far away from 5000k! Is this a
common
practice? Anyone can comment on the color temp of light sources in
DTp-41,
Eye-One, ICColor, etc?
It is very common practice to use a tungsten light source for the
illuminant in spectrometers. The light source spectrum is removed from
the measurement to give the spectrum for the material only, which can
then be combined mathematically with the D5000 theoretical spectrum to
give a result for the object as if it were illuminated with D5000
light. There are no illuminants that produce the exact D5000 spectrum,
so this is common practice.
