Make selective color adjustments, Make selective, Color adjustments – Adobe Photoshop CS4 User Manual
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USING PHOTOSHOP CS4
Color and tonal adjustments
Last updated 1/10/2010
A. Original color image B. Selecting Monochrome creates grayscale image C. Deselecting Monochrome and mixing channels tints elements of
grayscale image
Make selective color adjustments
Selective color correction is a technique used by high-end scanners and separation programs to change the amount of
process colors in each of the primary color components in an image. You can modify the amount of a process color in
any primary color selectively—without affecting the other primary colors. For example, you can use selective color
correction to dramatically decrease the cyan in the green component of an image while leaving the cyan in the blue
component unaltered.
Even though Selective Color uses CMYK colors to correct an image, you can use it on RGB images.
1
Make sure that the composite channel is selected in the Channels panel. The Selective Color adjustment is available
only when you’re viewing the composite channel.
2
Do one of the following:
•
Click the Selective Color icon
or a Selective Color preset in the Adjustments panel.
•
Choose Layer
> New Adjustment Layer
> Selective Color. Click
OK in the New Layer dialog box.
Note: You can also choose Image > Adjustments > Selective Color. But keep in mind that this method makes direct
adjustments to the image layer and discards image information.
3
In the Adjustments panel, choose the color you want to adjust from the Colors menu.
4
Choose a method from the Adjustments panel menu:
Relative
Changes the existing amount of cyan, magenta, yellow, or black by its percentage of the total. For example, if
you start with a pixel that is 50% magenta and add 10%, 5% is added to the magenta (10% of 50% = 5%) for a total of
55% magenta. (This option cannot adjust pure specular white, which contains no color components.)
Absolute
Adjusts the color in absolute values. For example, if you start with a pixel that is 50% magenta and add 10%,
the magenta ink is set to a total of 60%.
Note: The adjustment is based on how close a color is to one of the options in the Colors menu. For example, 50% magenta
is midway between white and pure magenta and receives a proportionate mix of corrections defined for the two colors.
5
Drag the sliders to increase or decrease the components in the selected color.
You can also save the settings you make for the Selective Color adjustment and reuse the settings on other images.
More Help topics
A B C