Color correct using the eyedroppers, Adjust hue and saturation, Components. see – Adobe Photoshop CS4 User Manual
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USING PHOTOSHOP CS4
Color and tonal adjustments
Last updated 1/10/2010
•
To set a point on the curve for the selected color in each color component channel (but not in the composite
channel), Shift+Ctrl-click (Windows) or Shift+Command-click (Mac
OS) in the image.
•
To select multiple points, Shift-click points on the curve. Selected points are filled with black.
•
To deselect all points on the curve, click in the grid, or press Ctrl-D (Windows) or Command-D (Mac
OS).
•
To select the next higher point on the curve, press the plus key; to select the next lowest, press the minus key.
•
To move selected points on the curve, press the arrow keys.
Color correct using the eyedroppers
You can use the eyedroppers in the Levels or Curves adjustment to correct a color cast such as 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 you want to be neutral and then removing the color cast from that area. Depending on the image, you can
use one or all three of the eyedroppers. The eyedroppers work best on an image with easily identified neutrals.
Note: The Set Gray Point Eyedropper tool
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.
Important: Using the eyedroppers undoes any previous adjustment you made in Levels or Curves. If you plan to use the
eyedroppers, it’s best to use them first and then fine-tune your adjustments with the Levels sliders or Curves points.
1
Identify an area in the image that you want to be neutral gray. For example, a paved road.
Use a color sampler to mark a neutral area so that you can click it with an eyedropper later.
2
Click the Levels or Curves icon in the Adjustments panel, or choose Layer > New Adjustment Layer, and then
choose Levels or Curves.
Note: You can also choose Image > Adjustments, and then choose Level or Curves. You would complete the following
steps in either the Level or Curves dialog box. But keep in mind that this method makes direct adjustments to the image
layer and discards image information.
3
In the Adjustments panel, double-click the Set Gray Point tool
. In the Adobe Color Picker, verify that the
currently selected color has identical R, G, and B values (for example, 128,128,128).
4
With the Set Gray Point Eyedropper, click the neutral area that you identified in Step 1. This should reset midtones
and remove the color cast from the image.
5
If necessary, make final adjustments in the Adjustments panel.
If you specified new target colors for an eyedropper, Photoshop asks whether you want to save the new target colors
as defaults.
Adjust hue and saturation
Hue/Saturation lets you adjust the hue, saturation, and lightness of a specific range of colors in an image or
simultaneously adjust all the colors in an image. This adjustment is especially good for fine-tuning colors in a CMYK
image so that they are in the gamut of an output device.
You can save Hue/Saturation settings in the Adjustments panel and load them for reuse in other images. For more
information, see “
” on page 163 and “