Re: filmscanners: which space?

["Maris V. Lidaka, Sr." <mlidaka@ameritech.net>]

Unfortunately there is one point which you don't mention - CMYK is defined
as the color space or gamut of *printable* colors.  In theory you could
perhaps have more colors using C, M and Y with the addition of K but today's
inks can't print all those colors and in fact can't print all the colors we
can see on the monitor.

When by definition CMYK is limited to printable colors, its gamut is smaller
than that of RGB.  CMYK is not defined mathematically but is defined using a
device-dependent (i.e. the printing press) methodology.

Maris

----- Original Message -----
From: "Karl Schulmeisters" <karlsch@earthlink.net>
To: <filmscanners@halftone.co.uk>
Sent: Sunday, May 27, 2001 11:55 PM
Subject: Re: filmscanners: which space?


| Consider this
|
| CMY are the complimentary colors of RGB.  This means that according to
color
| theory, you can mix any color in RGB that you would want to with CMY.
| The difference is that K is gray scale - intensity if you will.  So what
| that means is that if you were to look at a plot of the color spaces with
| the X axis going 'into' the page, for RGB, you would see only one 'sheet'
of
| color space.  For CMYK you would see a 'sheet' corresponding to each
| gradation of 'K'.  Clearly there is more gamut in CMYK.
|
| ----- Original Message -----
| From: "Karl Schulmeisters" <karlsch@earthlink.net>
| To: <filmscanners@halftone.co.uk>
| Sent: Sunday, May 27, 2001 7:32 PM
| Subject: Re: filmscanners: which space?
|
|
| > I'm not a photoshop expert.  I do know a bit about the abstract math
| behind
| > the colorimetry.  I don't see why you would not be able to do what you
| > suggest.
| > ----- Original Message -----
| > From: "Robert E. Wright" <rew@impulse.net>
| > To: <filmscanners@halftone.co.uk>
| > Sent: Sunday, May 27, 2001 6:55 PM
| > Subject: Re: filmscanners: which space?
| >
| >
| > > > CMYK is not a reduced color space compared to RGB.  Printer CMYK is.
| > But
| > > > that is because the color space of the inks is more reduced.
| > >
| > > OK. Are you suggesting that some sort of CMYK settings in Photoshop
| could
| > > make the CMYK mode's gamut more similar to RGB, and thus reduce the
| losses
| > > in RGB to CMYK to RGB conversions? (Asumming you would print to these
| CMYK
| > > settings.)
| > >
| > > Bob Wright
| > > Oops. That should have been ..."would not print to these CMYK
| settings..."
| > >
| >
|
|
|