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Mathias17 451 posts
Feb 20, 2012
Currently Being Moderated

My colors are disobeying me.

Jun 14, 2012 7:23 AM

Offender - Photoshop CS5

 

 

I tell a vector layer to be 100% Cyan, 0% Magenta, Yellow and Black (by double-clicking the Layer Panel thumbnail and punching in values).

 

I hit enter. Then I go back into it's color dialogue and I see that it's automatically changed to something like 70% Cyan, 15% Magenta, 0% Yellow, Black.

 

What the heck.

 

Assigned a new color profile - Abobe RGB '98. Got it closer. Still not happy. I want that process printer to know to use 100% for that part of the design.

 

apples-woooooooooooooooooooooooooooooooooooo.PNG

 

I don't want no stinkin' Magenter in meh Cyan!! Why, Photoshop? Why.

 

 

 

It may be odd that I design in RGB, just to convert to CMYK in order to produce the final production file but I design with this in mind, always keeping an eye on Out Of Gamut pixels, etc. Seems to work well.

 
Replies
  • Currently Being Moderated
    Jun 14, 2012 7:32 AM   in reply to Mathias17

    Well, if you want to achieve a primary CMYK-color this is one case where working in CMYK is called for – mind you, the apple can be placed as an RGB Smart Object.

     
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  • Currently Being Moderated
    Jun 14, 2012 7:39 AM   in reply to Mathias17

    Also are you certain your CMYK working space is the proper CMYK-space for this printing process?

     
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  • Currently Being Moderated
    Jun 14, 2012 8:14 AM   in reply to Mathias17

    In general editing photographic images in RGB even when printed CMYK makes complete sense.

    But with graphical elements that are supposed to have one or two process colors – it’s just a bit risky not doing those in CMYK (unless one has an »airtight« device link profile set up for the task, I guess).

     

    Either you should ask your print provider for a profile for the printer

    http://www.google.com/search?client=safari&rls=en&q=hpl25500icc+profiles&ie=UTF-8&oe=UTF-8

    or – as it seems to be a six color printer – you (and me) may be overthinking it and you providing an RGB image may turn out just fine.

    In any case it might be best to check qith your print-shop.

     
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  • Currently Being Moderated
    Jun 14, 2012 8:48 AM   in reply to Mathias17

    The 6C-separation is propably done with proprietary software in the printer’s RIP, so separating that in Photoshop may not be reasonable.

     
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  • Currently Being Moderated
    Jun 14, 2012 9:14 AM   in reply to Mathias17

    In addition to #6 C.Pfaffenbichler as well

     

    For large format inkjets it's not recommended to edit in CMYK.

    One uses just sRGB or AdobeRGB(98) and

    a) embeds the profile or

    b) tells the printer operator the color space explicitly

     

    Yellow, Magenta, Light Magenta, Cyan, Light Cyan, Black and

    eventuallyDark Gray and Light Gray are handled by the RIP.

    Thinking in "plates" is of no use. Converted to CMYK, one would

    have just four channels, but eight different inks.

     

    If a valid profile should be available, then it would be quite useful

    for Soft Proofing, which might help to avoid making ordinary apples

    too colorful...

     

    Best regards --Gernot Hoffmann

     
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