Re: CMYK or RGB device
Re: CMYK or RGB device
- Subject: Re: CMYK or RGB device
- From: Robin Myers <email@hidden>
- Date: Thu, 1 Jul 2004 20:48:50 -0700
On 1 Jul 2004, at 20:17, jc castronovo wrote:
----- Original Message -----
From: "Roger Breton"
---snip---
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.
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.
The only media even coming close to producing a true RGB image by your
criteria of which I am aware, without being an emissive device, is the
Polaroid instant movie film and the subsequent Polachrome 35 mm film.
This material is a monochrome imaging material that has a layer of red,
green and blue filter material that is used to expose and view the
image. This is a positive slide material. No CMY dyes are used. It is
well known for having a higher density than CMY dye slide films,
requiring a brighter projector to be acceptably viewed.
If you expand your criteria to other than prints, then laser RGB
projectors and LCD panels would qualify as RGB devices. Sometimes if
the choice is between RGB and CMY color production systems, RGB comes
out the loser. In an effort to make brighter LCD screens, many
manufacturers have investigated using CMY filters for the reason that
more of the spectrum is transmitted than with RGB filters.
Robin Myers
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.