Re: Quoting accuracy of color measurement instruments
Re: Quoting accuracy of color measurement instruments
- Subject: Re: Quoting accuracy of color measurement instruments
- From: Graeme Gill <email@hidden>
- Date: Wed, 31 Oct 2007 21:16:42 +1100
David Scharf wrote:
iOne Pro: Wow, 35 or 36 bands in 10 nm steps, but only measuring 3.5 nm
for each 10 nm band? (According to the on-line brochure).
No, the underlying CCD measures (approximately) at 3.5 nm spacing (and
naturally these bands overlap), and then it is re-sampled (and applies
wavelength calibration) down to 10nm spacing.
It's nothing tricky, just a diffraction grating and a 1D CCD in
both instruments.
My SpectroCam has 72 5nm bands. That's twice the resolution!
It's twice what's presented by the standard iOne Pro interface.
I've written a driver that also allows a 3.3 nm readings, although
the discrimination isn't that fine on either instrument I think
you will find. (ie. if you shine a monochromatic light at them.
more than one band will respond).
> Perhaps I
won't get a new spectro after all. A serial to USB adapter will work. I
just wonder how weak a link the old ProfilerPro package is, since none
of the new profiling packages support it. Or can the newer profiling
packages import the measurement table output by the SpectroCam?
You could almost certainly translate the readings so as to use
them with any package.
Graeme Gill.
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