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How to convert pantone in photoshop in the way i need (what is my mistake)

Forum|Forum|1 year ago
October 10, 2024
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Hi, I have a file, here it is - https://forum.rudtp.ru/resources/p3405.3516/download
I want pantone 3405C to be converted to cmyk as 100-0-100-20, I set this color in ColorPicker, then I go to "merge spot channel" and get color 87-20-100-6 !!!

How so? I set 100-0-100-20, not 87-20-100-6 !!!

What is my mistake?

How can I get the color I need (100-0-100-20) when converting pantone to CMYK?

PS
In Illustrator I see the same situation when converting my picture with pantone to CMYK.....

이 주제는 답변이 닫혔습니다.

davescm

Community Expert

Hi

You need to go back to basics and understand that in different colour spaces, the same colour is represented by different numeric values. So numeric values mean nothing unless referenced to a specific colour profile. Conversely, if you use the same numeric values in different colour spaces then you will see a different colour.

Changing to a different colour space is not the answer. That should be set to match the particular printing press you are using - there is no generic CMYK profile (or generic RGB profile fo that matter).

Lab values are independent of colour space, so if you type the Lab value into the colour picker (as suggested above by Stephen), the CMYK values that represent that colour in your CMYK colour space will be shown.

Dave

G

Gennady36741311vv21작성자

Known Participant

I get exactly the values that I set in Photoshop 2019 and do not get them in Photoshop 2022.
My color settings in both Photoshops are absolutely identical !!!

How do you explain this?

NB, colourmanagement

Community Expert

@Gennady36741311vv21 "I get exactly the values that I set in Photoshop 2019 and do not get them in Photoshop 2022.
My color settings in both Photoshops are absolutely identical !!!

How do you explain this?"

did the rendering intent perhaps change?

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management
Help others by clicking "Correct Answer" if the question is answered.
Found the answer elsewhere? Share it here. "Upvote" is for useful posts.

G

Gennady36741311vv21작성자

Known Participant

As a result, I do the conversion in Photoshop 2019, in Photoshop 2022 the conversion does not work correctly

Stephen Marsh

Community Expert

The spot colour is based on a Lab model colour book:

Conversions use colour management (Edit > Colour Settings), in this case your working CMYK profile, rendering intent etc.

Press the "Picker" button to change from the default Lab colour build and type in your required CMYK values:

Then when you merge your spot channel to CMYK in Photoshop you will get the overridden value:

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Gennady36741311vv21작성자

Known Participant

Hello, sorry, but I didn't understand ANYTHING that I should do in the Edit > Colour Settings menu

I have it like this -

Conrad_C

Community Expert

Based on your picture, the way a color is converted to CMYK is based on the profile U.S. Web Coated (SWOP) v2, the one selected under Working Space, CMYK.

If you aren’t happy with the CMYK values resulting from a conversion, you probably need to select a different CMYK profile. Ideally, you should select a CMYK profile representing the exact printing conditions that your job is targeting (the press, paper, and ink setup that will be used by the printing company to print your job).

For example, different CMYK profiles will apply different total ink limits or different black generation, and those will affect how color values are distributed across the CMYK ink channels.

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