Re: X-Rite EyeOne iSis with M1 option
Re: X-Rite EyeOne iSis with M1 option
- Subject: Re: X-Rite EyeOne iSis with M1 option
- From: Graeme Gill <email@hidden>
- Date: Mon, 11 Aug 2014 22:32:49 +1000
Steve Jenkins wrote:
> Oh, while we're on the subject, correct me if I'm wrong, but aren't the fluorescent
> agents, used for OB, absorbing UV, which we pretty much can't see, and the "agent"
> emits light at a lower frequency, to a part of the spectrum we do see -- which happens
> to be blue?
Yes. Florescent agents have an absorption spectrum that is often a mirror
image of the emission spectrum, and these cross over.
> Obviously there are phosphors out there that can fluoresce across the full
> spectrum(remember CRTs). So, is it the cost that prevents OBs from being full spectrum?
> Or some kind of energy issue ( i.e. CRTs used high energy electron beams to excite the
> phosphors)?
I'm not sure why you think this might be desirable - cheap paper is deficient in
blue reflectance, so using UV to add more blue to the appearance of the paper
is all that's needed.
A single phosphor can't really cover the full visual wavelength range,
and a concoction of phosphors would be difficult to stimulate
evenly - you'd be relying on some sort of cascade, UV triggering blue which
triggers progressively lower wavelength phosphors, the efficiency dropping
precipitously with each stage, and the absorption of one phosphor
sucking up light from another. I can't imagine it working.
CRT's work because you are hitting each type of phosphor directly with
electrons.
Graeme Gill.
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