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: Wayne Bretl <email@hidden>
- Date: Fri, 08 Aug 2014 20:50:55 -0500
OB's are deliberately blue to counteract the tendency of most non-fluorescent "white" fibers to be yellowish, and because the bluer white gives an impression of daylight. Laundry detergents have blue-emitting brighteners. Before these were available, "bluing" (a blue dye) was used to whiten clothes when washed; but of course a fluorescent blue brightener actually does brighten the fabric as well as making it less yellow.
-----Original Message-----
From: colorsync-users-bounces+waynebretl=email@hidden [mailto:colorsync-users-bounces+waynebretl=email@hidden] On Behalf Of Steve Jenkins
Sent: Friday, August 08, 2014 6:26 PM
To: Ben Goren; Robin Myers
Cc: 'colorsync-users?lists.apple.com' List
Subject: Re: X-Rite EyeOne iSis with M1 option
On Friday, August 08, 2014 17:21, Ben said:
==================[snip, snip]========================
...you owe it to yourself to go to FleaBay and buy a trio of red, green, and "blue" laser pointers for $10, as well as some cheap novelty plastic film diffraction grating and maybe a CD or DVD. Play around with them, and a great deal about optics and spectroscopy will start to make intuitive sense -- and even more so if you build a simple spectrograph with the diffraction grating and some fomecore or a cardboard box or the like and a pair of razor blades for the slit. One of the more mind-bending experiments is to look at a well-lit room through the spectroscope, shine a laser dot on a wall, and then try to find the laser dot in the view through the spectroscope. Or, add a second slit to make a monochromator, or....
Cheers,
b
===================
Ben, I love your encouragement to experiment! That's how we learn! Anyway, I find this light source great for quick and dirty OB evaluation. ( not too bright -- doesn't dazzle/overload your retina, like lasers do )
http://www.photonlight.com/led-flashlights/specialty-uv-ultraviolet-blacklight-led-flashlights/
The "Covert" option has a hood that hides/limits the light to forward, thus preventing glare in your eyes.
HTH - Steve
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? 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)?
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