Re: Colorsync-users Digest, Vol 2, Issue 473
Re: Colorsync-users Digest, Vol 2, Issue 473
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 473
- From: Robin Myers <email@hidden>
- Date: Mon, 28 Nov 2005 14:50:16 -0800
On Nov 28, 2005, at 12:58, Marc Levine wrote:
Mike/Roger/et al,
<snip>
With regards to Colorport. Yes - it's spectral data format is
specified in a
range from 400 to 700nm for compatibility with our instruments. What
that
means is - if you expect to load spectral data that was captured with
Colorport into MeasureTool, then you would need to change the format
to fit
the GMB reflectance data format. Because MT is looking for wavelengths
ranging from 380 to 730 (in 10nm increments), a user would need to
open the
doc in Excel, add the required columns, fill in the appropriate field
IDs
(380nm, 290 nm, etc...) and possibly adjust some info in the data
format
section of the CGATS header.
There is also the problem of what data to put in the extra bands. There
are three standard approaches; set the values to zero, replicate the
first or last value in the new bands (e.g. copy the 400 nm data into
the 380 and 390 bands, copy the 700 nm data into the 710, 720 and 730
nm bands), or perform some type of curve fitting to extrapolate the
data more intelligently (sometimes this works, sometimes not).
<snip>
On the measurement front, it is really not a firmware request that is
embedded in your postings, but a software request to the manufacturers.
Could both MT and Colorport work in a more synchronized way?
Absolutely. The
way to make this happen is not by changing instrument firmware (that's
a
part of the instrument's design). The way to make this happen is
through
application software, where there are liberties that can be taken to
better
cooperate with different data formats. (Cue Steve Upton, I suspect that
Colorthink may even do this already)
SpectraShop(tm) already works with any starting wavelength and any
ending wavelength between 360 to 780 nm with 10 nm bands. Work is
underway to extend this to any bandwidth interval. It also has a tool
to expand a shorter measurement interval to a larger one (e.g. 400-700
nm converted to 380-730 nm). I agree with Marc that tools need to be
more accepting of variations in the measurements.
Robin Myers
www.rmimaging.com
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