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Marco Ugolini wrote:
I have to admit that I have not profiled any inkjet device via both the
normal driver *and* a software RIP (it's always been one way or the other).
That would be a good test of this contention that the two routes produce
significantly different gamuts. Has anyone tried that?
I've done stuff like that, and it all depends on the profiles/separations/systems
involved. One system I tried a few years ago, had noticeably poorer gamuts
when run through RGB drivers than CMYK. A dedicated RIP may have access to
features or controls that affect the gamut, such as screening patterns,
dot sizes, per channel and total ink limits, not to mention black generation algorithms
that could make its gamut bigger or smaller than what an RGB driver is doing.
A poor RGB -> CMYK table in a driver will give a smaller gamut than
a CMYK driver, and it's all too easy to be poor, as ink jets of a few
years ago easily demonstrated. I would hope that more recent printers
fair better in that regard, but this may depend a lot on the manufacturers
color management awareness and skill. I have reasons to suspect that
not all manufacturers recognize their limitations in this regard.
Graeme Gill.
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