Re: RGB vs CMYK: gamut and some important notes for CMYK users

Keith,

I don't think that "Out of Gamut" would necessarily apply in the case of
making seperation negatives, since instead of using the printer/inkset color
space, you are using the "Gum Color" space you have chosen. The curves you use
for full color gum and the color pigments are what will determine the look of
the final image.

Mark Nelson
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www.PrecisionDigitalNegatives.com
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In a message dated 12/4/04 12:16:51 PM, Keith@gumphoto.com writes:

> Has anybody brought up the issue of "out of gamut"?  Reflecting upon the
> examples provided here, I remembered that I had read that Adobe (and the
> revered Blatner and Fraser) have always recommended that RGB should never be
> used for anything but video monitor output.  Digital printers, film
> recorders, and printing inks cannot reproduce the entire RGB spectrum.
> Photoshop's "separation engine" makes every effort to fill in out-of-gamut
> pixels with the closest colors available given the specified ink and
> separation settings.  Output in RGB will result in "gamut-clipping":  gaps
> in the image that contain will contain no information in a  non-video
> output.  (However, this may be a non-issue. If, as it was pointed out,
> printers automatically convert to CMYK, are those gaps filled in?  I don't
> know, because I don't output to a printer.)
>
Received on Sat Dec 4 13:44:40 2004