2 Replies Latest reply on Sep 3, 2012 11:52 PM by Grant_S

    Are these working space settings out of date for printer calibration?

    Grant_S

      Hi guys,

       

      I've colour calibrated my monitor using an i1 Display Pro 2 and now I'm in the process of hiring someone to colour profile my printer (I don't have the hardware to do that myself). This one particular company have sent me through a guide and have asked for me to set my working spaces to:

       

      RGB: Adobe RGB (1998)

      CMYK: Euroscale Coated v2

      Gray: Dot Gain 15%

      Spot: Dot Gain 15%

       

      I personally prefer to keep my RGB working space as sRGB because most RGB images I work with are for web use, but I use ProPhoto RGB for 16-bit per channel, printable RGB work e.g. photography (but that's rare for me to do). Having said that, I'm ok to settle with Adobe RGB if that's what they want. Gray and Spot are fine.

       

      My big concern is with the use of Euroscale Coated v2 for the CMYK working space. Isn't that outdated? I'm certain that Australia uses ISO standard profiles now, and it would be correct to set that to FOGRA39 (ISO 12647-2:2004) or to download either ISO Coated v2 or ISO Coated v2 300% ECI profiles.

       

      But I'm not confident enough to be 100% sure, and I'd like to be 100% sure before I suggest to them they're wrong.

       

      Do you guys know or have any input?


      Thanks!

        • 1. Re: Are these working space settings out of date for printer calibration?
          Gernot Hoffmann Level 3

          Grant,

           

          in my humble opinion you've got strange advice.

           

          Printer calibration (toner or inkjet) has absolutely nothing to

          do with working spaces like sRGB or offset processes like ISO

          Coated.

           

          One prints a so called target which is entirely defined by some-

          what round combinations of CMYK values (percentages 0, 10, 20

          ... 100 each  channel).

          After drying the print, the CIELab values are measured by a

          spectrophotometer, for instance EyeOne Pro, followed by gene-

          rating one or more profiles, for instance by GretagMacbeth

          ProfileMaker .

          The ICC profile consists essentially of multidimensional tables

          L a b --> C M Y K  and  C M Y K --> L a b.

           

          That's all, with one exception: some printers require in advance

          to the mentioned process a so called linearization, which can

          improve the accuracy, but without enlarging the gamut.

           

          Everything for one ink set, one paper or medium, one type of#

          rasterization (different target prints) and many other parameters,

          for instance the kind of Gray Component Replacement (GCR) 

          (different profiles based on the same target print).

           

          Once you've got your ICC profile, you can use documents with

          any sources:

          Images in sRGB, aRGB (Adobe RGB), images and vector graphics

          in any CMYK space like ISOCoated v2 eci or SWOP.

          Source profiles are defined in a Raster Image Processor (RIP)

          or in Photoshop. Destination profile is your measured ICC profile

          (evtl. plus linearization).   

           

          Therefore feel free to use any source profile. Personally I'm using

           

          for Inkjet: aRGB for Images and device CMYK for Text and vector

          graphic.

           

          for Offset: CMYK for everything. The ICC profile as recommended

          by  the print house. This is assigned to the standard process, even

          if the paper should be different.

           

          The conversion from RGB to CMYK should be supervised by soft-

          proofing in Photoshop (estimated appearance in CMYK), neces-

          sary corrections in RGB.

           

          For gray images, to be printed by K-only,  one has to observe the

          whole process carefully (preferably delivered as CMYK with void

          plates CMY).

           

          InDesign handles documents with different colorspaces correctly,

          but gray images with gamma other than 2.2 are not shown as

          they should be - one reason for not using gray, but CMYK-->000K.

           

          Illustrator cannot carry ingredients with different color spaces simul-

          taneously - very bad for general processes.

           

          Best regards --Gernot Hoffmann

           

          P.S.: everything valid for professional toner printers or inkjets,

          namely for PostScript printers - not for 'office printers'.

           

          Minor corrections edited by the author

          • 2. Re: Are these working space settings out of date for printer calibration?
            Grant_S Level 1

            Hi Gernot

             

            Thankyou very much for your response. What you've said, now you've said it, makes perfect sense.