Colour correction

RG
Posted By
Rob Graham
Aug 18, 2004
Views
288
Replies
2
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Closed
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
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color correct

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TN
Tom Nelson
Aug 18, 2004
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

In article <41231b48$>, Rob Graham
wrote:

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.
MR
Mike Russell
Aug 21, 2004
Rob Graham wrote:
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

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
www.curvemeister.com
www.geigy.2y.net

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