Colour correction

Discussion in 'Photoshop Tutorials' started by Rob Graham, Aug 18, 2004.

  1. Rob Graham

    Rob Graham Guest

    I've been using Color Pilot to adjust the colour in some underwater shots.
    I've found that PS 6 has more adjustments but I can't find out how to reset
    the colours based on selecting an area of black/white/grey.

    Also is there some way on which the settings can be saved to process a batch
    of photos?

    Can someone give some assistance please.

    Thanks in advance

    Rob Graham, Aug 18, 2004
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  2. Rob Graham

    Tom Nelson Guest

    Hi Rob,

    There are two ways to automatically neutralize areas of
    white/gray/black: Curves and Levels. Each has eyedroppers to force what
    you click to be those neutral tones. The defaults are 0-0-0 pure black
    and 255-255-255 pure white. To change those defaults, double-click the
    eyedroppers one after another and change the colour in the colour
    picker that comes up. When you exit the Curves or Levels dialog, you'll
    be asked if you want to save those tones as defaults.

    hope this helps!!
    Tom Nelson
    Tom Nelson Photography
    Tom Nelson, Aug 18, 2004
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  3. Rob Graham

    Mike Russell Guest

    Use curves (of course!). Start Image>Adjust>Curves.

    If you want to quickly get a better result, click on the gray eyedropper
    button, and then click on an object that has no color. Save the resulting
    curve settings in an acv file, and create an action that starts curves,
    loads your curve file, and clicks OK in the curves dialog.

    For an even better result, here's a more advanced technique. Load your
    image, and take a look at the red channel and make sure it has significant
    detail. If it does not, rescue the red channel by using the channel mixer
    to borrow data from the green channel and add data to the red channel. This
    alone may correct your image significantly and bring out other colors. Move
    the white end of the red channel horizontally toward the center of the
    curve until you get rid of the cyan cast that is the trademark of
    uncorrected underwater photographs. Now, instead of saving your image,
    reload the original (by clicking on the first entry in the History Palette),
    start recording an action, and repeat all the good things you just did.
    Stop recording, and save the action.

    Finally, use Photoshop's batch mode, or save a droplet, and process all your
    files using the same settings.
    Mike Russell, Aug 21, 2004
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