Color correct using the eyedroppers
You can use the eyedroppers in the Levels or Curves dialog boxes to correct a color cast—an unwanted tint from an excess of color (red, green, blue, or cyan, magenta, yellow). It’s easier to color-balance an image by first identifying an area that should be neutral and then removing the color cast from that area. Depending on the image, you may want to use one or all three of the eyedroppers. The eyedroppers work best on an image with easily identified neutrals.
is
used primarily for color correction and is unavailable when you
work with grayscale images.For the best results, don’t use the eyedroppers in images that require a large adjustment to map a pixel to the maximum highlight or minimum shadow values.
-
Identify
a highlight, midtone, and shadow area that should be neutral gray. Depending
on the image and the result you want, you may need to identify only one
area.
Use a color sampler to mark a neutral area
so that you can click it with an eyedropper later. -
Double-click the Set Black Point tool
, the
Set Gray Point tool , or
the Set White Point Eyedropper tool 
. Use
the Adobe Color Picker to specify a neutral target color.
If you’re working in RGB, enter the same values for R, G, and B to specify a neutral color. The neutral color should be close as possible to the values of the color sampler.
If you want to preserve specific details in the shadow or highlight, specify a value for the Set Black Point and the Set White Point Eyedropper tools that are within the gamut of the output device (printing press, laser printer, and so forth).
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