monitor calibration, gamma setting

Discussion in 'Photoshop' started by Wilfried, Feb 27, 2012.

  1. Wilfried

    Wilfried Guest

    (originally posted in comp.graphics.apps.photoshop, re-posted here)

    Hello all,
    I am editing my photos on a laptop (yes, I know that a laptop screen is
    suboptimal for this), presenting them on a LCD TV screen (Sony
    KDL-32EX402) and some of them are to be printed on an inkjet printer or
    a commercial printing service.

    I experienced that most jpegs coming from cameras are displayed
    satisfactory on the laptop as well as on the TV, and also on printouts.

    But the best pictures come from high contrast photos (such as back-light
    or dawn). I shoot them in RAW and reduce the high contrast by editing
    them on the laptop. These photos either look well on the laptop but are
    much too bright on the TV or are OK on the TV and much too dark on the
    laptop.
    I purchased a colorimeter (Spyder 3 Elite) and started calibrating the
    monitors (both the laptop and the TV). I found that using the default
    Spyder 3 setting of gamma 2.2 for the monitor does not solve the
    problem. If I set gamma to 1.4 in Spyder 3, the photos are looking quite
    similar on the laptop and the TV, but now they are looking too dark on
    other PCs. (I did not yet test printout of these photos.)

    Now my question: Which gamma setting in Spyder 3 is preferable for
    calibrating the laptop monitor?
    Or, how can I achieve good results on the TV as well as on printouts?

    Thanks for any hints,
     
    Wilfried, Feb 27, 2012
    #1
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  2. Wilfried

    Paul Simon Guest

    Hi,

    I have bit of experience with Color Munki but the idea for profile
    adjustment is the same. Gamma of 2.2 is recommended these days for all
    calibration. You may see comments about setting gamma to 1.8 for Macintosh
    but that was due to a quirk in printing many years ago. Mac people
    generally set color temperature to 5000K vs. 6500 for Windows. This is not
    really significant, especially for the issue you presented. I assume you are
    driving the TV from the laptop. You have created <two> profiles, one for
    the laptop display and one for the TV. Be sure you switch the color
    profiles to match the laptop or TV as needed.

    There will be color gamut differences too, But that is a secondary issue
    here.

    Good luck!

    Paul Simon
     
    Paul Simon, Feb 27, 2012
    #2
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  3. Wilfried

    Wilfried Guest

    Hello,
    and thank you for the reply.

    I CAN drive the TV from the laptop, but usually I don't. I plug my usb
    memory stick either directly in the usb port of the TV or in the usb
    port of the digital satellite receiver which is connected to the TV by
    HDMI.
    Playback of the test files from the Spyder 3 test DVD via the DVD player
    (also connected via HDMI) gives good results,
    but it seems that display of jpeg files via the TV's as well as the
    SatRec's usb port is bad. (Most time I use the SatRec because the TV
    displays the jpeg files in arbitrary order while the SatRec displays
    them sorted by file name.)
    Meanwhile I downloaded several test pictures from the internet,
    especially one which displays a grayscale in fine steps.
    Displayed via the TV usb port, the last three gray levels at the white
    end of the scale are indistinguishable, while the dark end grays are
    much too bright.
    Displayed via the SatRec usb port, three gray levels at each the dark
    and the white end are indistinguishable.
    Adjusting TV's brightness and contrast does not help in both cases, it
    only affects the middle tones.

    I will try whether driving the TV from the laptop gives better results,
    but I wonder why most unedited pictures from several digicams are
    displayed well via the SatRec's usb port while those test pictures and
    the edited pictures are not.

     
    Wilfried, Feb 28, 2012
    #3
  4. Wilfried

    bmocc Guest

    All that calibration does is translate colors from one color managed device
    to another for a SPECIFIC purpose.
    Profiling your monitor, laptop or otherwise, will not create an image that
    looks the same on any electronic display or media such as paper.
    Profiling/calibrating an HDTV attempts to make that screen reproduce a gamut
    that is consistent with the standard for digital television but has nothing
    at all to do with Photoshop style monitor calibration for printing.
    The reason calibration is desirable and works for printing with e.g.
    Photoshop is that the colors displayed on your monitor by the calibration
    software during the calibration process have a specific RGB value. Photoshop
    can then shift your processed image toward whatever color bias your monitor
    inherently possesses when you do color managed printing.
    Rather than gamut, particularly for printing, the key consideration is
    screen brightness: all LCD screens, regardless of technology, are inherently
    very much brighter than even glossy inkjet paper. Unless you are able to
    turn your monitors brightness down to a value of around 90 for calibration
    your prints will usually look dark. IPS panels are more desirable than the
    typical technology used in notebooks and most consumer flat screen monitors
    for color managed image processing as they are more able to have their
    brightness turned down while maintaining color gamut (you get what you pay
    for with a dedicated graphic arts monitors).
    You will require different "profiles" depending on the end use for your
    image. With a minimal of experimentation you should be able to identify a
    simple tweak to brightness and contrast that you can mechanically apply so
    that your image will display adequately on a specific display device.
    However if you are using a laptop you are using the absolute worst monitor
    possible for image processing.
     
    bmocc, Mar 2, 2012
    #4
  5. Wilfried

    Ulysses Guest

    You will require different "profiles" depending on the end use for your
    Thank you for clearing up an old question
    been using a laptop for photoshop and had color
    and resolution problems
    so now will transfer my files to the desktop and use
    photoshop there
    Ulysses
     
    Ulysses, Mar 2, 2012
    #5
  6. Wilfried

    Wilfried Guest

    Hello and thanks to all replies.

    As far as I understand, the purpose of color (icc) profiling is to
    display and print an image on all devices as identical as possible, so
    that there is no need to produce a different image for each output
    device.
    Although this is true, it turned out that my TV and SatRec are even
    worse.

    The (partial) solution of my problem was given as a reply to my question
    in http://www.dslr-forum.de/showthread.php?t=1036702

    I summarize the results:
    - Run the calibration with gamma=2.2, save the monitor profile
    and set it as default monitor profile in Windows.
    - Photoshop Elements (PSE) already uses the current monitor profile,
    but be sure that the output color profile is set to sRGB.
    - Activate color profile in IrfanView to display the image
    similar as in PSE.

    Now the bad My TV and SatRec do not interpret a color profile in
    the jpeg file.
    However they display the contents roughly like sRGB, with the exception
    that a small range of low brightness colors are displayed as black and
    high brightness colors are displayed as white (color clipping).
    Nevertheless the pictures now look approximately the same on the TV as
    on the laptop.
     
    Wilfried, Mar 5, 2012
    #6
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