RAW conversion color problem

Discussion in 'Digital SLR' started by Paul Furman, Mar 20, 2006.

  1. Paul Furman

    Paul Furman Guest

    The color looks fine to me assuming that's a magenta dress. There are
    adjustments on ACR for default color balance but I think it's unusual
    for folks to bother with that. I suppose some sort of color test chart
    would confirm/describe the issue.
     
    Paul Furman, Mar 20, 2006
    #1
    1. Advertisements

  2. Paul Furman

    Peter Guest

    I have a color problem when converting RAW files in Photoshop CS2 (Camera
    RAW plugin 3.3). I'm fairly new to all this RAW/color management stuff (have
    been shooting JPEGs up to now), so it's possible I'm missing something
    obvious.

    All my Canon 20D shots have red/magenta tint when converted in PS. Other RAW
    converters seem to reproduce colors better:

    http://www.ruksis.com/g2/main.php?g2_itemId=1198

    I even borrowed Eye 1 and calibrated my monitor and printer to make sure
    colors are consistent. PS conversion still looks way too red/magenta to me.

    Is there a 20D color profile I could feed into PS in order to fix the
    magenta issue?

    Peter
     
    Peter, Mar 20, 2006
    #2
    1. Advertisements

  3. Paul Furman

    Roberto Guest

    I have a color problem when converting RAW files in Photoshop CS2 (Camera
    Adobe Camera Raw (ACR) defaults are just a starting point. Fine
    tuning white balance and exposure frequently will yield better images.
    You could adjust the tint slider in ACR to shift the magenta-green
    conversion away from magenta, and the temperature slider lower away
    from red.

    You can calibrate your camera in ACR -- useful if you se a magenta-red
    shift across many types of images and lighting situations. See Bruce
    Fraser's creativepro article "Calibrating Camera Raw in Photoshop CS" -

    www.creativepro.com/story/howto/21351-1.html
     
    Roberto, Mar 20, 2006
    #3
  4. Paul Furman

    tomm42 Guest

    Doesn't look too bad, especially the Adobe ACR conversion #2. Two
    observations:
    Do you have a skylight filter on your lens? If so take it off.
    Many digital camera have problems with shades of purple, if the dress
    is more purple that could be the problem here. Certain films have this
    problem too, it just seems hard to mix the colors for a specific shade
    of puple.
    The flesh tones are very good in #2 that should be what you go by.

    Tom
     
    tomm42, Mar 20, 2006
    #4
  5. Paul Furman

    C J Southern Guest

    The raw converter will tailor the conversion based on the selections you
    make - the two that affect colour shifts are white balance and tint. Easiest
    way around it is to shoot a colour checker (or at a pinch even a light grey
    piece of card (preferably with a flash so we have a better idea of the
    temperature)) and then just use the built in tools for removing any cast.

    Once you know how the WB and tint need to be set then you save these as the
    new conversion defaults, and hey-presto - problem solved.
     
    C J Southern, Mar 20, 2006
    #5
  6. Paul Furman

    Paul Mitchum Guest

    There isn't a 'RAW/color management stuff' any more than there's a
    'JPEG/color management stuff.' RAW is just an extra step in your
    workflow.
    What you'll probably want to do is set white balance in ACR to 'As
    Shot.' The other software is probably keying off the camera settings,
    while ACR is doing its own thing.

    That said, like others mentioned: The colors don't seem off.
     
    Paul Mitchum, Mar 20, 2006
    #6
  7. Paul Furman

    Ed Ruf Guest

    Magenta tinted prints can be an indication of improperly set up double
    color management, ie enabling color management in both the printing
    application and the print driver. If so, chose one or the other, but
    NOT both.
    ________________________________________________________
    Ed Ruf Lifetime AMA# 344007 ()
    http://EdwardGRuf.com
     
    Ed Ruf, Mar 21, 2006
    #7
  8. Paul Furman

    Peter Guest

    All my Canon 20D shots have red/magenta tint when converted in PS. Other
    Funny but PS display and printouts have much heavier magenta tint than
    converted JPG... maybe my color profiles are off. I have been suggested to
    try using white balance card and use that as reference point when converting
    RAWs.

    Peter
     
    Peter, Mar 21, 2006
    #8
  9. Paul Furman

    Rod Williams Guest

    I don't see a problem either. It sounds to me like you have something
    wrong in your profiles/Photoshop setup. Other than a difference in
    exposure I see very little if any color difference.
     
    Rod Williams, Mar 22, 2006
    #9
  10. Paul Furman

    D-Mac Guest

    I recommend a Photoshop group but for those with the same problem -
    incidentally it is usually associated with Epson printers - I'll give you a
    quick and dirty test to try and then you can work back from it.

    Turn off all colour management in Photoshop.
    Set the white balance of your camera to 5500 K and go out in the middle of
    the day and take a picture.

    Use ACR to develop the image and set the white balance to 5500K (daylight).
    Do not do any colour correction in ACR or PS - remember this is a test.
    Choose "print with preview" and get full information in the screen.
    Choose print space as "same as source" for the source and use black point
    compensation.
    Make sure your printer is set to the correct paper combination and print the
    image.

    This is printing a S-RGB image straight to your printer without any
    compensation or adjustment of colour. It should print almost exactly as you
    see it on the screen. If it doesn't, you need to look at other areas for the
    problem. Like any "profile" you might be using for your monitor or
    non-genuine inks or paper in the printer.
     
    D-Mac, Mar 22, 2006
    #10
  11. Paul Furman

    Peter Guest

    The color looks fine to me assuming that's a magenta dress. There are
    I _must_ be doing something wrong.

    I have calibrated the monitor, generated the profile, and assigned it to my
    display using XPs Color Management applet. Colors do look reddish in ACR
    though, and Shop PSD files converted from RAW. Converted JPGs look fine
    (provided I convert directly in ACR screen using 'As Shot' parameters).

    I'm printing out testchart in Shop by setting Color Management to 'No Color
    Management', read the chart in using Eye One, and generate the profile.
    Printing out in Shop with Color Management set to 'Let Photoshop determine
    colors' and selecting the printer profile just generated results in red cast
    in printouts. Printer driver does not have the profile assigned - checked it
    twice!

    I'm lost. Maybe should have shot JPGs to start with ;-S

    Peter
     
    Peter, Mar 23, 2006
    #11
  12. Paul Furman

    Paul Furman Guest

    I'm not aware of any XP applet, the adobe gamma tool is in the control
    panel though.
    It's easy to get messed up, just keep studying <g>. It's not as tough as
    it sounds but there is no room for mix-ups.
     
    Paul Furman, Mar 23, 2006
    #12
  13. Paul Furman

    Peter Guest

    I _must_ be doing something wrong.
    http://www.microsoft.com/windowsxp/using/digitalphotography/prophoto/colorcontrol.mspx

    Indispensable if you have dual monitor setup (like mine)
    Thanks for the encouraging words! ;)

    Peter
     
    Peter, Mar 24, 2006
    #13
  14. Paul Furman

    Paul Furman Guest

    Paul Furman, Mar 25, 2006
    #14
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.