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 mfranzen3@wi.rr.com
sRGB Mark. See PantoneLIVE for L*a*b* values. Jon Sent from my iPhone
On Mar 30, 2015, at 7:07 PM, Mark Franzen <mfranzen3@wi.rr.com> 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 mfranzen3@wi.rr.com
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The reason you get different colors when you paste the same values into different RGB spaces is that each RGB space is unique. Although the same color may exist in each of those spaces the colors are in different locations within the space. Therefore when you paste the same coordinates (color numbers) into each space it references a different color. Probably a similar color but different. In some instances the difference can be dramatic. To get the same color you would have to convert the numbers to the representative color in the new space. This is what the Convert to Profile command does within Photoshop. Regards, Rob Brooks Institute, Faculty rwinner@brooks.edu ________________________________________ From: colorsync-users-bounces+rwinner=brooks.edu@lists.apple.com [colorsync-users-bounces+rwinner=brooks.edu@lists.apple.com] on behalf of Jon Meyer [jonmeyer@grafixgear.com] Sent: Monday, March 30, 2015 4:36 PM To: Mark Franzen Cc: colorsync-users@lists.apple.com Subject: Re: Pantone RGB/CMYK values sRGB Mark. See PantoneLIVE for L*a*b* values. Jon Sent from my iPhone
On Mar 30, 2015, at 7:07 PM, Mark Franzen <mfranzen3@wi.rr.com> 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 mfranzen3@wi.rr.com
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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 mfranzen3@wi.rr.com
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Mark Franzen wrote:
Why would those numbers not be given in L*a*b?
They seem to be cagey about their L*a*b* values. I notice that even though their Pantone Color Manager application has spectral values in its database, the application doesn't show them or the L*a*b* to you. If you export (save as..) a Fandeck as cxf, the L*a*b* value are in the resulting file. (ArgyllPRO ColorMeter makes use of that to match measured or specified colors to Pantone Colors. You can see this demonstrated at about the 9:30 mark on the Guided Tour video: <http://youtu.be/ODfCoUH0euQ> ) Graeme Gill.
On 31 Mar 2015, at 05:26, Graeme Gill <graeme2@argyllcms.com> wrote:
(ArgyllPRO ColorMeter makes use of that to match measured or specified colors to Pantone Colors. You can see this demonstrated at about the 9:30 mark on the Guided Tour video: <http://youtu.be/ODfCoUH0euQ> )
Pantone’s +Coated and +Uncoated libraries for the eXact can be downloaded here: <https://www.xrite.com/product_overview.aspx?ID=1980&Action=support&SoftwareID=1231> And they work perfectly with ArgyllPro — although they are named "e-Job1" and "e-Job2" for coated and uncoated respectively. I tried exporting libraries from Pantone’s Color Manager but the Mac version in Yosemite works as well as the pantone.com web site... -- Martin Orpen Idea Digital Imaging Ltd
participants (6)
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G Mike Adams
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Graeme Gill
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Jon Meyer
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Mark Franzen
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Martin Orpen
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Rob Winner