Re: Pantone RGB/CMYK values
Re: Pantone RGB/CMYK values
- Subject: Re: Pantone RGB/CMYK values
- From: G Mike Adams <email@hidden>
- Date: Mon, 30 Mar 2015 18:48:57 -0500
Mark,
There isn't a "right" RGB or CMYK. The RGB and CMYK equivalents are going to depend on which RGB and which CMYK, and to compound things, my understanding is that while the RGB numbers in the bridge book relate to sRGB, the CMYK numbers are some CMYK space Pantone created and has never released, so they don't relate completely to any commonly used CMYK space. (Although from playing with it over the years, the space seems fairly close to SWOP to me.)
Keep in mind though that there are plenty of Pantone colors that are out of the gamut of sRGB, so not all the RGB numbers, even using sRGB, are going to be equivalents to the L*a*b* value of all colors.
Best quick way to get the L*a*b* value of any PMS is just to select color books in the picker, the pick that color. It'll give you the value right there.
Mike Adams
Correct Color
On Mar 30, 2015, at 6:07 PM, Mark Franzen wrote:
> Hello -
>
> I am sure this question has been asked before, but I need to ask it again anyway.
>
> I am wondering about the RGB and CMYK values that are give by Pantone in their “Color Bridge” book and elsewhere. It has the Solid swatch and a CMYK process swatch. Under those swatches are RGB and CMYK values. I fully understand the differences between the solid and process colors, but I am a little unclear as to WHICH RGB and CMYK those numbers are referring. Why would those numbers not be given in L*a*b?
>
> I did see in the first few pages of the Pantone book that sRGB was referenced, and I am assuming that when Pantone gives RGB numbers, at least in the book that I am referencing, that those numbers relate to sRGB - maybe I am answering my own question there.
>
> I did also read that the CMYK “screen tint” percentages were given. How do those numbers relate to a CMYK file that I could use in Photoshop?
>
> If I create a new Photoshop file in sRGB, Adobe RGB (1998), and ColorMatch and fill each those with the numbers called out, I get three images with very different color appearances. I also did the same thing with three different CMYK files. I was using Pantone Red 032C for my test. RGB values in the book were R-237 G-41 B-57. I also understand that each RGB and CMYK is going to have their own gamut and “flavor”, but my question is, which one is right?
>
>
> Thanks for the help.
>
> Mark Franzen
> email@hidden
>
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