Mixing Colors Selectively - Adobe Photoshop CS6 User Manual

Book excerpt: Using the Color
Replacement tool
Elaine Weinmann and Peter Lourekas
Walk through the process step by step.
1. Select the Color Replacement tool
2. In the options bar, choose a brush tip. Generally, you should keep the blending mode set to Color.
3. For the Sampling option, choose one of the following:
Continuous Samples colors continuously as you drag.
Once Replaces the targeted color only in areas containing the color that you first click
Background Swatch
4. From the Limits menu, select one of the following:
Discontiguous Replaces the sampled color wherever it occurs under the pointer.
Contiguous Replaces colors that are contiguous with the color immediately under the pointer
Find Edges Replaces connected areas containing the sampled color while better preserving the sharpness of shape edges.
5. For Tolerance, choose a low percentage to replace colors very similar to the pixel you click, or raise the percentage to replace a broader
range of colors.
6. To produce a smooth edge in the corrected areas, select Anti-aliased.
7. Choose a foreground color to replace the unwanted color. (See Choose colors in the toolbox.)
8. Click the color you want to replace in the image.
9. Drag in the image to replace the targeted color.
If the range of replaced colors is too small, increase the Tolerance setting in the options bar.

Mixing colors selectively

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
Choose Layer > New Adjustment Layer > Selective Color. Click OK in the New Layer dialog box.
(CS5) Click a Selective Color preset in the Adjustments panel.
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. Do one of the following:
In CS6, choose the color you want to adjust from the Colors menu in the Properties panel. You can also choose a Preset that you've
saved.
In CS5, choose the color you want to adjust from the Colors menu in the Adjustments panel.
(CS6) In the Properties panel, choose a Selective Color preset from the Preset menu.
4. Select a method in the Properties panel (CS6) or choose a method from the Adjustments panel menu (CS5):
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.
. (If the tool isn't visible, access it by holding down the Brush tool.)
Replaces only areas containing the current background color.
in the Adjustments panel.
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