Color Cast on printed images

Discussion in 'Photoshop' started by JP White, Dec 26, 2003.

  1. JP White

    JP White Guest

    I was fortunate enough to have a color printer as a gift this Christmas,
    a Canon i475D.

    Prints out of it are not as represented on the screen (I do have my
    monitor calibrated), so I tried to find out where the problem lies. I
    flattened and converted the image to CMYK and threw away the color
    profile. On printing in PS7 I told it under color management to allow
    the printer to color manage. I thought by doing this PS would leave at
    all up to the printer and I could then tweak the printer settings.
    However the images come out with a yellow color cast.

    As another experiment I saved the image as a PDF file and had Acrobat
    print the image, *NO* color cast - in fact it looked half decent (short
    on saturation maybe , but no cast).

    So my question is, if I told PS to allow the printer to manage the color
    how is the yellow cast creeping in? If the print driver were at fault
    then I should get a color cast from Acrobat too!. PS is obviously
    'doing' something. How can I setup PS to leave the image alone and let
    me tweak the printer settings only?

    The Canon comes with 7 cryptically named ICM files, anyone know what
    they are for? (The documentation doesn't even mention them).

    JP
     
    JP White, Dec 26, 2003
    #1
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  2. JP White

    Tom Harrison Guest

    Tom Harrison, Dec 26, 2003
    #2
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  3. JP White

    JP White Guest

    JP White, Dec 26, 2003
    #3
  4. JP White

    Phil Guest

    Their advice is to set the color profile in the Print With Preview
    window; you can also do this with Image/Mode/Assign Profile, in which
    case you'll see the color shift required to match up properly to the
    printer/paper combination.
     
    Phil, Dec 29, 2003
    #4
  5. JP White

    Flycaster Guest

    The color shift you see is not what you think it is. You need to Convert to
    Profile, not Assign to Profile, to do this correctly. By simply assinging,
    the underlying color numbers are mapped directly to the new profile space,
    with no attempt to keep the colors similar. God only knows what will come
    out of the printer, but it certainly will not look like your original file!
    OTOH, converting to profile *shifts* the underlying color numbers before
    mapping them to the new profile space, thus preserving the original colors
    (as best the profile can make them using whatever rendering intent you have
    chosen).

    Also, FWIW, no consumer Canon printer on the market today comes with true
    ICC profiles. They are certainly capable of being profiled (I've made quite
    a few very nice Canon paper profiles for friends and clients), it's just
    that Canon hasn't gotten aboard the profile wagon yet by shipping their
    printers with independent canned paper profiles that can be used for
    soft-proofing.
     
    Flycaster, Dec 30, 2003
    #5
  6. JP White

    Phil Guest

    Yes, the correct procedure is to "Convert to Profile." This is also
    the proper way to profile images prior to having prints made on
    Noritsu/Frontier processors. Funny though, "assigning" creates a very
    bluish screen image that then prints properly on matte paper (Epson).
    So what is the "Assign to Profile" option actually used for?
     
    Phil, Dec 30, 2003
    #6
  7. To assign a profile to an image which does not have a tagged profile,
    but you know which one it should be. Say that you know that the image is
    in AdobeRGB color space, but for some reason it has lost its tagged
    profile. You could then assign AdobeRGB profile to it. Most (if not all)
    cosumer digital cameras are in sRGB, but many cameras do not tagg the
    images with a profile.
     
    Johan W. Elzenga, Dec 30, 2003
    #7
  8. JP White

    Flycaster Guest

    It seems that most consumer digicams that don't have RAW capability do, in
    fact, either tag those files with sRGB, or use that color space to define
    the color numbers. RAW files, otoh, are output in the camera's native color
    space which (at least in the case of my D60) appears to be larger than even
    ARGB98. I say "appear" because I have not quantitatively measured it, but
    it is certainly larger than sRGB.

    I'm not a big fan of sRGB, nor is anyone that works regularly in CMYK, or
    with modern 6-7 color inkjets.
     
    Flycaster, Dec 31, 2003
    #8
  9. JP White

    Flycaster Guest

    John did an excellent job of answering that question for you. Usually the
    only time you'd ever need to do this is when you open an untagged file for
    the first time.
     
    Flycaster, Dec 31, 2003
    #9
  10. JP White

    Hecate Guest

    Yes. I only find the colour space useful when I know I'm only
    producing an image for web use and *definitely* don't want to print
    it.
     
    Hecate, Dec 31, 2003
    #10
  11. JP White

    Flycaster Guest

    Either that, or when I occasionally send stuff to Costco which uses a Fuji
    photoprinter that employs sRGB by brain-dead default.
     
    Flycaster, Dec 31, 2003
    #11
  12. JP White

    Hecate Guest

    The printer or Costco? ;-)
     
    Hecate, Jan 1, 2004
    #12
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