Re: CMYK or RGB device
Re: CMYK or RGB device
- Subject: Re: CMYK or RGB device
- From: Ernst Dinkla <email@hidden>
- Date: Sat, 03 Jul 2004 11:40:40 +0200
Roger Breton wrote:
But of course, the image is still made with CMY dyes - not RGB.
The Lightjet (or LVT, Lambda, Chromira, Frontier, DLab, Fujix, etc.) is just
a machine used to expose photographic media in place of an enlarger. These
devices all expose photo media with colored RGB (additive) light, but the
resulting processed image is still CMY (subtractive) regardless of how it's
exposed. It's CMY and not CMYK because there's no black "plate".
Now a monitor is a true RGB device, as is a video projector. They're fed RGB
data and they produce their images with RGB light.
john c.
Good points. Totally agree. Evidently, color devices can be classified
according to their physical color synthesis type (subtractive vs additive).
And for the purposes of color management, color devives can be classified as
a function of the type of drive signals they accept. Hence, a LightJet is an
RGB device. That's from a "logical" perspective. From a "physical"
perspective, with regards to the type of color synthesis it uses
(substractive), I have to concur with your apt remarks that, like a
photographic system, a LightJet is a CMY device.
"There's always a background"
The actual display you are looking at after the process should be
the base to categorise. That's also how the target should be made
for profile measurements. If the older processes ever allowed
color management one could make this summary:
RGB additive:
CRT Monitor, beamer etc
Polachrome
Defender Dufaycolor
Early Kodacolor 16mm motion picture
Dufay Dioptichrome
Thames>Paget>Finlay
Early Agfa Color
Lumiere's Autochrome>Filmcolor>Lumicolor
McDonough plates (used by F. Tennyson Neely in the Spanish
American war 1900)
Ives Photochromoscope + Kromskop
<Lippmann (difficult to categorise, first multispectral?)>
CMY(K) subtractive:
Gasparcolor > Cibachrome
Vogel>Fischer> Siegrist>Mannes>Godowsky> first dye coupler films
Defender Chromatone
Carbro
Technicolor
Pinatype
Ives other processes with imbibition, HI-CRO, Tri-Pak
Ozobrome>Raydex>Tri-Carbro
1924 first telephone transmission of a 3 color separation
(Uvachrome image)
Traube' Uvachrome
Levy, Kurtz, Klietsch inventions for letterpress and gravure
CMY(K) printing
du Hauron's first prints
Sipley's "A half century of color", Macmillan 1951, has that
information and much more. The motto in it:
"There's always a background" which gets more weight in time.
Philips and other companies are busy with Electronic paper etc
that may bring us CMY(K) monitors as well.
Ernst
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