Re: Matching Pantone Colors w/HP 5000 and Postershop
Re: Matching Pantone Colors w/HP 5000 and Postershop
- Subject: Re: Matching Pantone Colors w/HP 5000 and Postershop
- From: Graeme Gill <email@hidden>
- Date: Fri, 30 May 2003 13:55:59 +1000
Roger Breton wrote:
>
> .... or a process that
>
> relies on a human to do a series of printouts, tweaking the CMYK values
>
> each time, and checking the color match by eye, for thousands of colors,
>
> over and over again.
>
Please don't tell me that's how PANTONE builds its tables?
As I understand it, yes. Before the days of readily available
color instruments, profiles etc., then this is a very practical
approach. Of course, if faced with such a task, I'd imagine what
one would actually print out a CMYK hyper-cube of (say) 8x8x8x8 steps
in each colorant (4096 patches), and then do a search though it for
the closest visual match to each spot color. One could then print
a "variations" type print (that nominal CMYK with (say) +/-3% steps
in all primaries around it), to fine tune the result.
Another approach (that has its problems) would be to choose a black
generation rule, and reduce it to a three dimensional search. The trap
is that unless the black generation is really sophisticated, you
lose a lot of the dark saturated color gamut (a fault that many
readily available "RGB" printing devices seem to have, judging
from the gamut surface of their ICC profiles.)
Graeme Gill.
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