Re: RGB Spaces
Re: RGB Spaces
- Subject: Re: RGB Spaces
- From: "Pablo Roufogalis L." <email@hidden>
- Date: Sun, 06 Oct 2002 08:25:18 -0400
Hello Henrik and thanks for your reply.
At 09:54 AM 10/6/02 +0200, Henrik Holmegaard wrote:
The first reason for choosing the monitor class was that a class was
needed which would support RGB as device space and bidirectionality for
separation and simulation.
Of the device classes, scnr is only required to be unidirectional from
device space to connection space, so you cannot use an scnr profile to
simulate another space because you cannot convert into an scnr profile.
Printer and monitor profiles are required to be bidirectional, so you can
convert from one of these spaces into the connection space and from the
connection space into one of these spaces. Thus the Adobe InDesign 2.0
manual states that only bidirectional profiles may be used as working spaces.
The second reason for choosing the monitor class over for instance the
color space class was that it suited the Photoshop CMS at the time.
Printer profiles must be table-based in the ColorSync 2.0 and later
format, and monitor profiles may be matrix-based or table-based. RGB
working spaces are idealized, matrix-based monitor spaces. The approach
through a simplified gamma model reproduces gray for R = G = B and has
historical reasons in the Photoshop CMS which are no longer important.
A lot, yes.
I'd guess then that the internal construction of a monitor profile requires
it to be described in terms of raw phosphor and a correction curve and even
if the profile is used as a color space it has to be described that way. It
is not possible to use the ideal RGB points directly but rescaled instead.
Many thank again and regards.
Ing. Pablo Roufogalis L.
Aretecnica
email@hidden
http://www.aretecnica.com
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