How can I do separations in more colors than CMYK?

New Here ,
Dec 01, 2020

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In CMYK it is not possible to print all colors correctly, specially not nature photos with flowers for example. I know it is possible to print in more colors like with 7 colors, CMYK + green, orange and wiolet. But how can I manage to make separations for 7 plates? Is there some plug-in for this?

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How can I do separations in more colors than CMYK?

New Here ,
Dec 01, 2020

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In CMYK it is not possible to print all colors correctly, specially not nature photos with flowers for example. I know it is possible to print in more colors like with 7 colors, CMYK + green, orange and wiolet. But how can I manage to make separations for 7 plates? Is there some plug-in for this?

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Dec 01, 2020 0
Adobe Community Professional ,
Dec 01, 2020

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If you google the term Hexachrome it will provide details about a six-color process (adding Orange and Green) that Pantone introduced via Photoshop about ten years ago.  It was subsequently discontinued.  That leaves you with working with “touch plates” (called “kickers” by some old pros) that are modified versions of one or more of the CMYK plates and run in an additional special color or two to extend the normal four-color gamut.                      

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Dec 01, 2020 1
LEGEND ,
Dec 01, 2020

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You may want to consult with your print providers about what they can offer. 

If they offer anything beyond CMYK you might be best served to work in a »large« RGB Space (Adobe RGB, eciRGB v2, …) and let them handle separation. 

 

I think there may have been a renewed interest in such processes lately but it’s probably primarily relevant for packaging. 

https://www.printing.org/blog/7-things-you-need-to-know-about-7-color-printing

https://www.lifewire.com/4-6-8-color-process-printing-1077448

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Dec 01, 2020 1
Adobe Community Professional ,
Dec 01, 2020

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Is the job really going to an analogue press? Your printer may not discuss it with you as this is now mostly about price, so they could run the job digitally. If this was the case, the digital press would likely have a wider gamut than standard press CMYK, however, they probably simulate standard press CMYK as a standard target.

 

Is this a theoretical question or practical?

 

If practical, do you have a quote from a printer to produce the job as CMYK vs other methods?

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Dec 01, 2020 1
New Here ,
Dec 02, 2020

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It is not a theorethical question. I have printer capable to print in up to 8 colors. My idea is to use CMYK + green, orange and violet to get gamut needed for printing a book on wild orchids. My problem is to find a way to make the separations. I have found that the packaging industry uses 7 color print but their printers are not fo book printing.

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Dec 02, 2020 0
LEGEND ,
Dec 02, 2020

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The ability to print 8 colors is not that surprising – to print both sides of a publication’s pages in 4C in one go the press needs 8 units anyway. 

But does the printer have any experience with 7-color-printing? Do they offer separation-services? 

 

And a side-note: As you seem very focused on color accuracy you may, before printing the whole run, want to see proofs – which may be pointless and it may only be truly reliable to do a small test-run. 

Which may run into a lot of money … 

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Dec 02, 2020 0
Adobe Community Professional ,
Dec 02, 2020

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OK, if it is a practical concern, then I'd start with my previous question:


Do you have a CMYK vs. CMYKOGV quote from a commercial printer with the expertise to print such a project?

 

Do you really need +OGV? Perhaps only adding violet will be enough.

 

If you have the budget for 7 colour printing, how will this translate into a final commercial product? Will the target market be willing to pay extra, or will you absorb the cost and make less profit?

 

Run length may help, shorter runs would be too costly for 7 colour offset print, so you may go digital. There may be a wider CMYK gamut available in a given digital press, so it is then a matter of colour management and the best input image would be a wide gamut RGB image. This would need to be planned and tested with care and communication with the commercial printer.

 

Some digital presses offer 5 or more colours.

 

It is even possible to use non standard CMYK offset press setups to achieve a wider gamut than traditional CMYK. Don't forget screening, with FM screening may also improve colour in light pastel hues.

 

But in my opinion, it is all theoretical until you have quotes and are happy that the final printed output meets your vision for a "more lifelike" reproduction of the flowers.

 

I'd start with the money, that will dictate the technical requirements for image processing.

 

 

 

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Dec 02, 2020 1
New Here ,
Dec 02, 2020

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It's OK with the printing cost to print 7 + 7 colors. We have a good corporation with the printer and in our normal CMYK jobs we never need proofs. I know what I get compared with my monitor. The printing office can not provide the separation service.

OGV is definitly needed. Now I need either a tool for the separations or a service-bureau who can help us. Then we need to make a true life test-run in the printer. So now in the first place I would like to find the tool for separations. Earlier it was possible to make other separations i Photoshop with more colors like Hexachrome in six colors. I do not know if there is possible to find a plug-in for this?

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Dec 02, 2020 0
Adobe Community Professional ,
Dec 02, 2020

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Forget Hexachrome, it is dead.

 

You can create a multi-channel ICC profile with the appropriate ICC profiling software and Photoshop can separate to such a profile using the "Advanced" Convert to Profile option:

 

mc-icc.png

 

This is not something that really works well using "generic" profiles, best results would be for the printer to do a press run using supplied 7 colour profiling targets, then you would measure in the charts and create the profile. If you don't have the software, hardware or knowledge to do this, then I would recommend hiring a consultant to do this for you, so add that to the budget.

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Dec 02, 2020 1