Re: Pantone Sim Color Shifts
Re: Pantone Sim Color Shifts
- Subject: Re: Pantone Sim Color Shifts
- From: Greg Nuckolls <email@hidden>
- Date: Wed, 28 Mar 2001 14:18:18 -0600
David Broudy wrote (extra info deleted):
>
I can understand why the Lab numbers for a spot ink would not change as it
>
is a point of reference for simulation in rgb/cmyk, but I would think that
>
the same would apply to a process simulation of that spot ink, which has
its
>
own reference Lab numbers that while different from those of the spot ink
>
are still a point of reference to a splotch of process color in a Pantone
>
book which is presumably the color I want to reproduce if I choose PMS
>
494CVP.
I've been working on updating my company's custom Pantone Sim swatches to
the new 2000 values lately, and have found the same thing. The justification
I've come to believe is that the Pantone Swatch (C or U), being device
independent color, behaves outside of the RGB or CMYK gamut reference
points... but are linked in through Lab, as you said. Only after a
conversion is done, or the PS file is processed, do the colors get linked to
a color space based on Pantone's LUT created for that device. Pantone
Process, on the other hand, is very much device dependent, and CMYK... so
its values will change depending on the working space or profile being used.
I don't know if this is right or wrong... but it makes a certain amount of
sense to me! Any takers?
Greg Nuckolls
Color Analyst
A&E Products Co., LP
www.aeproducts.com