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christianherbstreuth
christianherbstreuth
Known Participant
January 31, 2020
Question

Cropping RGB to CMYK values

  • January 31, 2020
  • 3 replies
  • 1071 views

Hello,

 

i work in Photoshop, use eciRGB V2 and later convert to PSO Coated v3

 

As usual the colors get paler after conversion etc - so far everything is clear.

 

I'm looking for a function to simulate the later CMYK result while working in RGB color space - not only latently via > View > Color Proof, but e.g. as a settings layer on top of my layers and dynamically cropping the result to the colors printable in CMYK.

 

Is there such a function ?

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3 replies

NB, colourmanagement
Community Expert
NB, colourmanagementCommunity Expert
Community Expert
February 1, 2020

Hi

 

you ask 

I'm looking for a function to simulate the later CMYK result while working in RGB color space - not only latently via > View > Color Proof, but e.g. as a settings layer on top of my layers and dynamically cropping the result to the colors printable in CMYK.

 

Is there such a function ?

 

I don't believe there is

proof colours satisfies most users. 

 

I hope this helps

neil barstow, colourmanagement.net

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christianherbstreuth
christianherbstreuthAuthor
Known Participant
February 1, 2020

Thanks...

 

I'm trying to establish a workflow at an agency.

 

The goal should be that the graphic designers can no longer send RGB layouts to clients that cannot be converted to CMYK in the same colour later - so the impression is different. Therefore an automated solution would be the best ...

rob day
Community Expert
rob dayCommunity Expert
Community Expert
February 1, 2020

An eciRGB image with out-of-gamut color in PS and placed in ID with Overprint Preview off

 

 

PS Proof Setup set to PSO Coated and InDesign with Overprint on—results in matching CMYK simulations:

 

 

Exported for the client to PDF/X-4 with no color conversion, the RGB color is unchanged but displays for the client as it will convert into the CMYK Output Intent profile:

 

 

    Mylenium
    Mylenium
    Legend
    January 31, 2020

    Assuming actually picking safe colors is the issue regardless of what profile is active, you might wanna try magicPicker or similar. Those tools have built-in options for alternate gamuts or force-limiting color selections.

     

    Mylenium

    christianherbstreuth
    christianherbstreuthAuthor
    Known Participant
    February 1, 2020

    I will have a look on magicPicker – Thanks

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    January 31, 2020

    Why is proof not satisfactory? That is the most accurate preview you can get - you see exactly, in real time, how the printed result will look (as long as you have a wide gamut monitor that covers the target color space).

     

    If you also want to check numbers and histogram as you go, you can use smart objects. Convert the eciRGB document to a smart object, and then convert that to PSO Coated.

     

    Double-click the smart object in the Layers panel, and the embedded eciRGB file opens in a separate window.

    christianherbstreuth
    christianherbstreuthAuthor
    Known Participant
    February 1, 2020

    Proof is only a visual check. 

    I need an automatic, dynamic cropping of my Picture while retaining all the advantages of the RGB colour space (filters etc). 

     

    The Smart Object is a nice workaround - I will check if this makes sense in practice ... Thanks

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