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Thread: Changing to CMYK profile in Photoshop

  1. #1
    Junior Member pj1976 is on a distinguished road
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    Changing to CMYK profile in Photoshop

    What is the best icc profile to use when converting an RGB image to CMYK in photoshop?

    THanks

  2. #2
    PRC Member Tony14 will become famous soon enough
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    Hi Pj1976,

    Your CMYK ICC profile must match your printing condition.

    If you print on offset sheetfed, and the printer prints according to ISO12647-2 on paper type1/2, you must use ISOCoated v2 (300%).

    If your plan to print on the same press with uncoated paper: PSO Uncoated.icc, etc.

    If your image is dedicated to be printed for a newspaper: ISONewspaper26v4, etc.

    The best way is to ask to your printer. Any case, if you do not know, make your CMYK separation with ISOCoated v2 (Biggest "standard" CMYK gamut)... the printer should be able to handle your file if it's correctly tagged (output intent)

    Hope that helps

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    tim
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    I advise you FOGRA39 or GRACoL 2006 for sheetfed offset printing
    it best for me

  4. #4
    PRC Member Tony14 will become famous soon enough
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    To have more clarity for pj1976,

    Fogra39 = ISOCoated v2 (300%) that is used everywhere expect in the US.

    GRACoL2006 is the "ISOCoated v2" used in the US

    That's the big picture... of course, you can find some printers that use Gracol in Asia, or ISOCoated in the US... :)

  5. #5
    Junior Member Geppo1982 is on a distinguished road
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    I suggest to use Fogra39 because it's the most recent profile for standardized offset printing.

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    Junior Member alex_prihodko will become famous soon enough alex_prihodko's Avatar
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    Use profile ISO Coated v2 (ECI)

  7. The Following User Says Thank You to alex_prihodko For This Useful Post:

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    Junior Member spankingtime69 is on a distinguished road
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    also in eu

    Quote Originally Posted by Tony14 View Post
    To have more clarity for pj1976,

    Fogra39 = ISOCoated v2 (300%) that is used everywhere expect in the US.

    GRACoL2006 is the "ISOCoated v2" used in the US

    That's the big picture... of course, you can find some printers that use Gracol in Asia, or ISOCoated in the US... :)
    ..we use ISOCoated v2 for best result, or uswebcoated swap2

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    Donor cityhunter is on a distinguished road cityhunter's Avatar
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    Quote Originally Posted by spankingtime69 View Post
    ..we use ISOCoated v2 for best result, or uswebcoated swap2
    Hi,
    Hi,

    we're using this settings :

    1. from RGB files ( either sRGB, Adobe 1998 ), convert to eciRGBv2
    to have a wider gamut

    2. after the convert to eciRGBv2 , convert to LAB
    to preserve the expanded gamut

    3. then convert to CMYK , with a profile of your choice
    whc is ISOv2 or use a deviceLink profile convertion

  10. #9
    PRC Member Tony14 will become famous soon enough
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    @cityhunter,

    Step 2, convert to Lab is useless. RGB to CMYK uses ICC cLut, AtoB (device to PCS (Lab) ) then BtoA (PCS (lab) to Device (CMYK). Therefore, it's useless.

    It might have an interest to convert to Lab for editing purpose... but not for classic RGB to CMYK conversion.

    Btw, it's not possible to use a devicelink profile using your method.

    Hope that helps.

  11. #10
    osc
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    devicelink??

    Quote Originally Posted by Tony14 View Post
    @cityhunter,

    Step 2, convert to Lab is useless. RGB to CMYK uses ICC cLut, AtoB (device to PCS (Lab) ) then BtoA (PCS (lab) to Device (CMYK). Therefore, it's useless.

    It might have an interest to convert to Lab for editing purpose... but not for classic RGB to CMYK conversion.

    Btw, it's not possible to use a devicelink profile using your method.

    Hope that helps.

    could you expland about devicelink, that what use for?
    i an the newbie, and interested to color management, i.m learning how to use gretagmachbeth colorprofile 5, could anyone help???

    Thanks

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  13. #11
    Banned mae4444 is on a distinguished road
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    hi

    i think at the first convert to colormachRGB because its clear RGB and more near from cmyk withaout loding more data and then convert to SWOP V2 or V3 Beacause its more compatabl with most RIP and closed for the press

  14. #12
    PRC Member Tony14 will become famous soon enough
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    @osc

    DeviceLink Profile is a one of 7 types of ICC profiles.
    DeviceLink profile is dedicated to merge 2 ICC profiles (deviceprofile) into only one.
    By doing that, you can add colorimetric exceptions such as purity for your primaries/secondaries colors, etc. You can avoid to get CMYK text due to a classical deviceprofile conversion for instance.

    It's also a way to make new CMYK separation and thus achieve important InkSavings or hamonize CMYK separation on a same page.

    Hope that helps! (if so, please click on the button below "Thanks !") Thank you by advance

  15. #13
    Junior Member Masseria is on a distinguished road
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    For me best way to obtaing colours is:

    - Set your display with sRGB and work in SRGB profile as well.
    - Save Jpeg,Tiff, PSD ,etc on RGB 16 Bits. to obtain bigger quantity of possible colours
    - If you have a CMYK Printer, the software will auto-convert it to CMYK using the BEST WAY Possible, GREAT RESULTS FOR ME. A little more changes and you will obtain Outstanding results.

    Check it and then you tell me.

  16. #14
    shampa
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    Masseria, that will severely restrict the range of colours you can achieve. Try printing a bright cyan or a dark green. If you wish to take the RGB route then I would recommend using eciRGB v2 if going to offset, or ProPhoto RGB if you have a wide-gamut printer. The quality of your CMYK output profile will have a large influence on the results you get.

  17. #15
    Donor neon is on a distinguished road
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    Quote Originally Posted by cityhunter View Post
    Hi,
    Hi,

    we're using this settings :

    1. from RGB files ( either sRGB, Adobe 1998 ), convert to eciRGBv2
    to have a wider gamut

    2. after the convert to eciRGBv2 , convert to LAB
    to preserve the expanded gamut

    3. then convert to CMYK , with a profile of your choice
    whc is ISOv2 or use a deviceLink profile convertion
    i convert first to 16 bit, then ecirgbv2, then isocoatedv2 then back to 8 bit

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