RE: Spectrolino repair
RE: Spectrolino repair
- Subject: RE: Spectrolino repair
- From: Roger Breton <email@hidden>
- Date: Fri, 12 Feb 2016 06:34:49 -0500
The way I understand the "problem", one light source is needed to cover the non-fluorescing part of the spectrum. That could be a white LED or a tungsten lamp. But, in my opinion, a second lamp is needed at 365nm to excite fluorescence from the substrate. Does ISO-13655 accurately describe this or does it only gloss over the detail of the required illumination, stating the general terms that it "ought" to be a D50-like SPD and leaving the details of the implementation to manufacturers?
I used a Techkon Spectrodens II that has M0, M1, M2 flavors.
I used the i1pro2.
I could be using an FD-xx.
I could be using a Barbieri.
Presumably, none of the manufacturers quite use the same components and methods.
Which is "best"? Newer characterization data all specify M1 but it's obvious that "M1" comes in many flavours.
/ Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of Ray Cheydleur
Sent: 11 février 2016 08:46
To: email@hidden >> ColorSync <email@hidden>
Subject: Re: Spectrolino repair
Graeme is precisely correct, the KM FD series, i1 Pro2 and i1iSis 2 are using a modeling process (as does Argyle and i1Profilers OBA module), the eXact uses instead an approach using filtered Tungsten with additional sources in the UV to provide the spectral power distribution at the measurement plane. Either approach is completely valid for OBA’s as they are well studied and modeled. The issue comes when you look at other potential fluorescing agents. Then the model may, or very likely may not, perform as expected and thus the eXact is the better choice for these more complex situations.
RayC
Ray Cheydleur
Printing and Imaging Product Portfolio Manager email@hidden
Roger Breton wrote:
please forgive my technical ignorance but is there anything fundamentally wrong or flawed in the following approach :
It's a modeling approach, the same in principle as used by ArgyllCMS FWA compensation, and the i1pro2 M1/M2. You calibrate for the media's fluorescent response by measuring with the instrument light sources, and then use a model to predict how it will look under a real D50 spectrum.
Graeme Gill.
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