Re: filmscanners: which space?

["Karl Schulmeisters" <karlsch@earthlink.net>]

Good point, I had forgot that.  And this is in essence why in a given
configuration, the CMYK space is more compressed than RGB.
----- Original Message -----
From: "Maris V. Lidaka, Sr." <mlidaka@ameritech.net>
To: <filmscanners@halftone.co.uk>
Sent: Sunday, May 27, 2001 11:48 PM
Subject: Re: filmscanners: which space?


> 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..."
> | > >
> | >
> |
> |
> |
>