Pantone

[Jean-Marc]

Hello, i am stuck with this problem since yesterday and I can't solve it.  In Affinity Photo does anyone know how to proceed to change a Magenta channel to Pantone direct tone ( Rubin red ). I need to keep the initial render of the photo but I only want to replace Magenta. I have located the right Pantone in the sample list, I select it to make it foreground, I select the Magenta ( with the edition mark ) and when I choose the option Fill I only get a white and empty channel and the thumbnail is white too...Does anyone can help me , Thanks and sorry for my English...

[firstdefence]

Welcome to the forum Jean,

What are you trying to do, maybe explaining that will help us help you. 

[Jean-Marc]

OK, i have a photo in YMCK mode ( for printing ) , but I need to change the MAGENTA and YELLOW with two colors from a PANTONE chart. My question is how to do this change ? 

 

 

 

[walt.farrell]

I don't think you can fill a single channel with a color.

A color has several channels, (R,G,B) or (C,M,Y,K).

Your M and Y channels are each purely one of those, not a mix, in various opacities.

You could probably extract one channel of a Pantone color and put it into one of your channels, but not the complete Pantone color.

[Jean-Marc]

Thank you Walt,  I think to another way to get what I want. Extracting Magenta and Yellow, past them on a layer ( 2 layers for my project ) and fill-in them with the Pantone. Thanks again for your answer.

[walt.farrell]

You're welcome.

[lacerto]

)...)

 

[Fixx]

If you just want to replace M and Y plates with Pantone versions, your printer can do it if you tell him to. Colour reproduction will be affected quite a lot.

[h_d]

If you want Affinity Photo to display what the image might look like with M swapped for PMS Rubine Red and Y swapped for another colour (let's say PMS 116C), I think you can approximate this using a Channel Mixer adjustment layer.

First you need to know the CMYK values for the two replacement colours. Luckily Pantone supply these on their website.  Rubine Red C is C0 M100 Y24 K4. 116C is C0 M10 Y98 K0.

Open the image, call up a Channel Mixer.

With the Output Channel set to CMYK Magenta, dial in the CMYK values for Pantone Rubine Red C.

Now set the Output Channel to CMYK Yellow, and dial in the CMYK values for Pantone 116C.

 

Hope this helps...

 

 

[Jean-Marc]

Thanks a lot for your help, now that that I can get my Pantone channels, I have placed my photo in Publisher and made a PDF HD export, it works fine. No signal in original M and Y channels, and two Pantone in the printing list; Now the last test  i have to check is the file check right with the CTP RIP..

Thanks again for all, I am a beginner on AFF Photo, and it is really nice to get help like that.

[lacerto]

(...)

[h_d]

Thanks for the explanation @Lagarto Am I right in thinking that you're applying these calculations only to the Magenta output channel, and is there any reason for that?

I was applying my own solution to the Magenta output channel (to equate to Rubine Red) and to the Yellow output channel (to equate to PMS 116 C). As far as I can see, given the image I chose, this doesn't result in an 

35 minutes ago, Lagarto said:

absurdly intensified Magenta channel

No doubt what I was doing was incorrect, though.

[lacerto]

(...)

[h_d]

Understood, thanks!