Re: CMYKOrGrRB?
Re: CMYKOrGrRB?
- Subject: Re: CMYKOrGrRB?
- From: Graeme Gill <email@hidden>
- Date: Mon, 28 Jun 2004 15:08:50 +1000
- Organization: Color Technology Solutions
Douglas Rhiner wrote:
Would there be any benefit, or what would happen if I were to run my
Roland FJ-500 with an inkset combination of CMYKOrGrRB?
Would the removal of the light-cyan and light-magenta and the addition
of red and blue broaden the gamut of my printer significantly?
How about taking Orange out and replacing with a light-black?
I know epson is playing with red and blue these days....
Any musings on this subject would be greatly appreciated.
It comes down to what you want to achieve. You can "broaden the gamut"
in any number of ways, but broadening in one area will often be at the
expense of another area. This is both by the choice of inks, and how
the chosen inks are used.
One of the more surprising things is that the gamut can be affected
most dramatically by particular combinations of inks, even if the
inks on their own don't expand the gamut much. The Orange and Green
inks you mention above for instance, aren't much outside the gamut
that can be achieved with just CMY, but when Orange and Green are
used in combination with CMY, the gamut can be significantly
extended. Similarly, combinations of light ink and Orange and Green
can significantly extend the gamut in some directions.
Another aspect not widely recognized is that it's one thing to
have a set of inks that (using every available combination) can
achieve a larger potential gamut, but it's another thing to make
that whole gamut fully available. Because almost all general color
separation is done using interpolation, and because almost no
printing device can achieve perfect registration between the
different color planes, it is important to maintain continuity of
ink values throughout the gamut (putting it another way, it's not
practical to have an instantaneous jump between one set of
ink values that produces a particular color, and another
quite different set of ink values that produces a nearby color).
The continuity requirement probably means that certain parts of
the possible gamut can't be reached, or that they can only
be reached at the cost of preventing other areas of the gamut
from being reached.
In summary, I suspect that you can only play the game of
adding and making use of extra inks to expand the gamut
in a skillful way, if you can define the gamut, or the gamut
directions you would like the expansion in.
There is at least one paper published in SIGGRAPH, that covers
the choosing and using of custom inksets. A copy seems to be at:
<
http://grail.cs.washington.edu/projects/ntone/article.pdf>
Graeme Gill.
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| | >CMYKOrGrRB? (From: Douglas Rhiner <email@hidden>) |