Re: CMYK or RGB device
Re: CMYK or RGB device
- Subject: Re: CMYK or RGB device
- From: Roger Breton <email@hidden>
- Date: Thu, 01 Jul 2004 22:26:09 -0400
>
Until now I've been under the assumption that LightJet type devices,
>
that expose a light reactive media, and dye-sub printers, that use Red,
>
Green and Blue dyes in some form, are RGB devices.
To me the LightJets are true RGB devices much like a Fuji Frontier or a
Kodak Led printer. The photographic media they expose is formed of three
layers of dyes, cyan, magenta and yellow. The sources of light used to
expose this media is a mixture of a red laser, a green laser and a blue
laser. Each having specific wavelenghts. So, in a strict physical sense, any
devices that uses that kind of technology can only be classified as some
kind of "R" "G" "B" device -- IMO.
>
What was brought up in the forum was that there is no such thing as a
>
RGB printing device due to the fact that true RGB is a
>
transmissive-additive proposition where CMYK is a
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reflective-subtractive proposition.
>
This makes complete sense to me.
I might add that what makes a LightJet a true RGB device is that the three
RGB lasers can be controlled directly and their intensity can be varied on a
scale from (for argument sake) 0 to 4096, or more, depending on the
particular digital to analog converter used it in. But the key here is that
the drive levels to this kind of device is specified in *RGB*. That is, each
pixels having a specific RGB value to begin with are imaged with a certain
intensity or Red light (laser), Green light and Blue light. For me that's
quite a sufficient criteria for qualifying as an RGB device.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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