Re: The PANTONE Goe System
To get PANTONE Lab values for their colors, I went into Photoshop, clicked the Foreground color swatch, clicked Color Libraries, chose Book: PANTONE solid coated, type in a color number (such as PANTONE Reflex Blue C), and get the Lab values (the look of that color that we want to match as close as possible in any given printing condition, in this case with PANTONE Reflex Blue C it says L: 19, a: 26, b: -68).
But we can't match this color in CMYK. I can try though to get as close as I can. And what profile I choose or program I choose to make the profile I use makes all the difference. Let's prove it.
First, I set my rendering intent in color settings to Absolute Colorimetric Intent and my Info window's second color readout to Lab color (so that the Lab values I'm looking at in the Info window are always printed Lab values).
Second, I make a new Lab document and fill with the Lab values of PANTONE Reflex Blue C, which is L: 19, a: 26, b: -68.
Third, I duplicate this document multiple times.
I keep one document as Lab with the correct Lab values in it.
I convert each of the duplicates using different rendering intents and profiles, each giving different results.
GRACoL2006_Coated1v2 (official profile by X-Rite), Perceptual, BPC on or off = CMYK 100,84,2,28 and Lab 24,6,-36
GRACoL2006_Coated1v2 (official profile by X-Rite), Saturation, BPC on = CMYK 100,92,0,2 and Lab 26,13,-46
GRACoL2006_Coated1v2 (official profile by X-Rite), Saturation, BPC off = CMYK 100,93,0,2 and Lab 26,14,-46
GRACoL2006_Coated1v2 (official profile by X-Rite), Relative Colorimetric, BPC on = CMYK 100,87,4,18 and Lab 25,8,-39
GRACoL2006_Coated1v2 (official profile by X-Rite), Relative Colorimetric, BPC off = CMYK 100,86,3,25 and Lab 24,7,-37
GRACoL2006_Coated1v2 (official profile by X-Rite), Absolute Colorimetric = CMYK 100,85,3,21 and Lab 24,7,-38
Now that's just the possible results from using one CMYK profile. Here other results, each using the same characterization data but different programs to make the CMYK profile I'm converting to. All these profiles are made by different programs, so give different CMYK results from the same Lab color, even when using the same rendering intent.
GRACoL2006_Coated1_GCR_bas (by colormanagement.org using basICColor), Perceptual, BPC on or off = CMYK 100,88,0,0 and Lab 27,12,-46
GRACoL2006_Coated1_GCR_bas (by colormanagement.org using basICColor), Saturation, BPC on or off = CMYK 100,86,0,0 and Lab 28,11,-46
GRACoL2006_Coated1_GCR_bas (by colormanagement.org using basICColor), Relative Colorimetric, BPC on or off = CMYK 100,89,0,0 and Lab 27,13,-46
GRACoL2006_Coated1_GCR_bas (by colormanagement.org using basICColor), Absolute Colorimetric = CMYK 100,88,0,0 and Lab 27,12,-46
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Perceptual, BPC on = CMYK 99,98,0,6 and Lab 24,16,-43
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Perceptual, BPC off = CMYK 98,98,1,8 and Lab 24,16,-42
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Saturation, BPC on = CMYK 99,98,0,6 and Lab 24,16,-43
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Saturation, BPC off = CMYK 98,98,1,8 and Lab 24,16,-42
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Relative Colorimetric, BPC on = CMYK 99,96,0,11 and Lab 23,14,-42
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Relative Colorimetric, BPC off = CMYK 98,99,1,16 and Lab 22,15,-40
GRACoL2006_Coated1v2_PerfX (PerfX Color Management Pro™), Absolute Colorimetric = CMYK 98,98,1,13 and Lab 23,15,-40
Now when we compare the results of these three GRACoL2006 ICC profiles, using all available combinations of rendering intents and BPC options, we see that GRACoL2006_Coated1_GCR_bas ICC profile made using basICColor by colormanagement.org gives about the same results no matter what rendering intent is used or if BPC is used or not. So the default rendering intent Relative Colorimetric Intent and BPC could be used and give the best results. This profile also gives the best (by far) reproduction of Reflex Blue on GRACoL2006_Coated1, when comparing these three ICC profiles.
So for PANTONE Goe colors (or any out-of-gamut colors to best be reproduced, no matter what rendering intent is chosen, or if BPC is chosen or not), this test has proven that it's going to have to happen in the making of the CMYK profile. This test shows that the program that makes the profile is all important. For me, this test has proven what ICC profiles I'll likely be using in the future, or at least what program I want to make the profiles I use.
If I wanted to test out uncoated and these profiles and the conversion I get, I can. Using the default Relative Colorimetric Intent with BPC on, I get:
ISOuncoated (by ECI.org) = CMYK 99,100,0,0 and Lab 39,8,-32
ISO Uncoated and uncoated_FOGRA29_GCR_bas (both by color management.org using basICColor) = CMYK 100,95,0,0 and Lab 39,7,-33
Uncoated FOGRA29 (ISO 12647-2-2004) (made by Adobe) = CMYK 100,79,29,4 and Lab 40,-2,-21
For uncoated, using the default rendering intent and BPC on gives results that could be better IMO, although the basICColor profile from colormanagement.org is still the best. All need improvement if possible (I can't even tell you what's going on with Adobe's uncoated 29 profile?!?!?)
Don