4Choose a preset brush from the Brush type list box on the property bar.

If you want to customize the brush, specify the settings you want on the property bar.

5Drag in the image window.

You can also

Increase the effect of the brush across an area	Click the Cumulative button	on the
without clicking over the area multiple times	Stroke attributes bar that displays in the
	Brush settings docker. This option is
	available only for some of the Effect tools. If

the Brush settings docker is not open, click

Window ` Dockers ` Brush settings.

Apply the effect to an object and the background simultaneously

Click the Merge source button on the Dab attributes bar that displays in the Brush settings docker. This option is only available when the Cumulative button is disabled.

Working with color channels

You can adjust the color and tone of an image by making changes directly to the image's color channels. The number of color channels in an image depends on the number of components in the color mode associated with the image. For example, black-and- white, grayscale, duotone, and paletted images have only one color channel; RGB and Lab images have three channels; and CMYK images have four color channels. For more information about these color models, see “Understanding color models” in the Help.

Displaying, mixing and editing color channels

Although color channels represent the colored components of an image, they are displayed by default as grayscale images in the image window. However, you can display these channels in their respective colors so that the red channel is tinted red, the blue channel is tinted blue, and so on.

You can mix color channels to balance the colors of an image. For example, if an image has too much red, you can adjust the red channel in an RGB image to improve image quality.

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You can edit color channels the same way that you edit other grayscale images. For example, you can select areas, apply paints and fills, add special effects or filters, and cut and paste objects in the image channel.

Splitting and combining images using color channels

You can split an image into a series of 8-bit grayscale image files — one for each color channel of the color mode. Splitting an image into separate channel files lets you edit one channel without affecting the others, save channel information before you convert the image to another mode, or associate channels from one mode with another mode for editing purposes. For example, if you have an oversaturated RGB image, you can reduce the saturation by splitting the image into the HSB mode and reducing the saturation

(S) channel. When you finish editing the images, you can combine them into one image. The images are combined automatically using equal values.

You can split an image into the following color channels.

Splitting mode	Color channels created
RGB	Red (R), green (G), blue (B)
CMYK	Cyan (C), magenta (M), yellow (Y), black
	(K)
HSB	Hue (H), saturation (S), brightness (B)
HLS	Hue (H), lightness (L), saturation (S)
YIQ	Luminance (Y), two chromaticity values (I, Q)
Lab	Luminosity (L), green/magenta (a), blue/
	yellow (b)

To display color channels

• Click Window ` Dockers ` Channels.

You can display color channels using their respective colors by clicking Tools ` Customization. In the Workspace list of categories, click Display, and enable the Tint screen color channels check box.

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To mix color channels

1Click Image ` Adjust ` Channel mixer.

2Choose a color mode from the Color model list box.

3Choose an output channel from the Output channel list box.

4Move the sliders in the Input channels area.

To edit a color channel

1In the Channels docker, click the channel that you want to edit.

If the Channels docker is not open, click Window ` Dockers ` Channels.

2Edit the image.

To split an image using color channels

• Click Image ` Split channels to, and click a color mode.

Images in the CMYK and Lab color modes must be split into their original component channels.

To combine images using color channels

1Click Image ` Combine channels.

2In the Mode area, choose a color mode option.

3In the Channel area, choose a channel option and click a filename from the Images list to associate the channel with a file.

4Repeat step 3 until all the channels in the Channel area have been associated with an image from the Images list.

From here

For more information about	In the Help index, see...
Adjustment filters	adjustment filters
Working with color channels	color channels

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