Tài iệu Photoshop cs5 by Dayley part 75 ppt

n Setting the brush behavior In addition to setting the brush shape and attributes, Photoshop provides many additional options that define the behavior of the brush as you apply painting

One of the most useful features of the Bristle Brush preview is that it provides you with the ability

to see the behavior of the painting stroke through a simple animation As you paint, the brush comes down to the bottom of the preview window The dashed line close to the bottom represents the paper, and you can see the bristles bending as the brush stroke is applied This feature is most useful if you are using a stylus pen, because it also shows you the pressure and angle of the brush,

as shown in Figure 16.20

FIGURE 16.20

The Bristle Brush preview window animates the movement of the brush and bristles when you are applying

paint stokes You can see the curvature of the bristles caused by the pressure and angle of the stylus pen

Light pressure Hard pressure Angled pen

Top Side

Cursor

Note

The preview window shows two different views of the brush: the top and side views To toggle between the

two views, click the preview window n

Setting the brush behavior

In addition to setting the brush shape and attributes, Photoshop provides many additional options that define the behavior of the brush as you apply painting strokes These options are available by selecting them in the Settings menu below the Brush Tip Shape setting These settings can be tog-gled on and off by selecting or deselecting the check box next to them

The settings also can be locked and unlocked by clicking the lock icon next to the name Locking the setting keeps the values static, even as you toggle between other brushes and change other set-tings Settings that are not locked can be reset to the default values by selecting Reset All Locked settings from the Brush panel options menu This feature is great if you need to reset the behavior

of the brush and start over

The following is a list of the simple behavior settings in the Brush panel that do not have additional dialog box options:

l Noise: This adds noise along with the paint as the stroke is applied This has the effect of

adding extra texture to the paint stroke and minimizing harsh changes made by editing paint tools

l Wet Edges: This tries to add an element of wetness of the painting effect in the edges of

the stroke This can help soften the edges of paint strokes This option is not needed or available when you are using the Mixer Brush tool

l Airbrush: When this option is selected, the stroke is applied in gradual tones to the

image This is a great way to soften the effect made by editing paint tools

l Smoothing: When this option is selected, the brush stroke produces smoother curves

This option is most effective when you are using quick paint strokes with a stylus This is

a nice option, but it may produce a slight lag time when rendering the stroke

l Protect Texture: When this option is selected, the same pattern and scale are applied to

all brush presets that have a texture to help simulate a consistent canvas texture when painting with multiple, textured brush tips

The following sections cover the more advanced behavior settings in the Brush panel that contain extra dialog box options

Shape Dynamics

The Shape Dynamics settings, shown in Figure 16.21, are designed to help you control the size, angle, and shape of the brush during the actual painting stroke

FIGURE 16.21

Setting the shape dynamics of the brush tip

Here are the settings you can configure to control the Shape Dynamic effect:

l Control: The Control setting defines what input is used in determining the variance

applied by the jitter settings Setting the Control to Fade allows you to specify how many steps the jitter adjustment is applied over The other settings allow you to use the pen pressure, tilt, and stylus wheel values to control the variance that’s applied The Size Jitter, Angle Jitter, and Roundness Jitter settings all have Control settings that allow you to define how the value of each is controlled

l Size Jitter: The Size Jitter settings control the variation in the brush tip’s size as the stroke

is being created by dragging the cursor A Size Jitter setting of 0 percent means that the brush tip size doesn’t change at all during the stroke The higher the percentage, the more the size dynamically changes as the stroke is being made The Minimum Diameter setting specifies the minimum size that the jitter can reduce the brush as the stroke is being applied

Using the Pen Tilt setting to control the size jitter gives you the most control If you are using the Pen Tilt option in the Control setting, the Tilt Scale option can be used to define the amount of variance in the Size Jitter The larger the Tilt Scale setting, the more vari-ance you see in the size of the brush

l Angle Jitter: The Angle Jitter setting allows you to vary the angle of the brush based on

different Control options In addition to the regular Control options, if you have a stylus tablet that Photoshop recognizes attached to your system, you have the option to use the following:

l Rotation: This varies the angle of the brush based on the rotation of the stylus pen.

l Initial Direction: This varies the angle based on the initial direction of the brush

stroke This is similar to holding the brush at a specific angle throughout the stroke and is a great option if you are using the brush to add calligraphic text

l Direction: This varies the angle based on the current direction of the brush stroke

This reduces the impact that flat brushes have when changing angles

l Roundness Jitter: The Roundness Jitter setting allows you to vary the roundness of the

brush as the stroke is being created The more round the brush, the more consistent the brush stroke is Reducing the roundness allows for more dramatic brush strokes to appear

in the image You can specify a Minimum Roundness value that keeps the brush from varying too much

l Flip X Jitter/Flip Y Jitter: The Flip X Jitter option flips the jitter across the X axis of the

painting stroke The Flip Y Jitter option transposes the jitter across the Y axis of the paint-ing stroke

Scattering

The Scattering settings, shown in Figure 16.22, are designed to help you apply a scattering effect as you apply the brush stroke The Scattering option creates the effect of scattering the brush tip in a random displacement along the path of the stroke, as shown in Figure 16.23

FIGURE 16.22

Setting the Scattering options of the brush tip

FIGURE 16.23

This shows the effect of using the scattering option One of the lines is drawn without scattering, the other

with scattering

Without scatter

With scatter

Here are the settings that you can configure to control the Scattering effect:

l Control: The Control setting defines what input is used in determining the variance

applied by the scattering settings Setting the Control to Fade allows you to specify how many steps the scattering adjustment is applied over The other settings allow you to use the pen pressure, tilt, rotation, or stylus wheel values to control the variance that is applied

l Scatter: The Scatter settings control the variation in the scattering of the brush as the

stroke is applied The variance of the scattering is controlled by the method specified in the Control setting

l Both Axes: When this option is selected, the brush tip is scattered both horizontally and

vertically When this option is not selected, the brush tip is scattered only horizontally or vertically in a direction perpendicular to the movement of the stroke

l Count: This specifies the amount of brush tips to include in the scattering.

l Count Jitter: This specifies the amount to vary the scattering and how to control the

vari-ance of the count based on the Control setting

Texture

The Texture settings, shown in Figure 16.24, are designed to help you apply a texture effect to the brush strokes Using the texture effect, you can simulate textures such as an oil paint canvas or wall that show up in the brush strokes

FIGURE 16.24

Setting the texture options of the brush tip

Here are the settings that you can configure to control the Texture effect:

l Texture: This allows you to select the texture from the patterns list that is currently selected

in the Presets Manager Clicking the Texture option displays the list, and you can click the triangle button to display a list of preset lists and options to load and save presets

l Invert: This inverts the pattern used to apply a texture to the brush stroke.

l Scale: This sets the size of the pattern applied to the brush stroke Setting this value too

high makes the pattern very apparent in the brush strokes Setting this value too low elim-inates the result of applying the pattern

l Texture Each Tip: When this option is selected, the texture is applied individually to

each brush mark in the brush stroke rather than to the entire stroke when it is finished

Enabling this option is very CPU-intensive, but this option is required for the depth vari-ance option to have an effect

l Mode: This specifies the blending mode to use when applying the texture pattern to the

brush stroke (before it is applied to the pixels below) This setting does not override the blend mode setting in the Brush tool options

l Depth: This specifies how deeply the paint penetrates into the texture A value of 0

per-cent means that no pattern shows through

l Minimum Depth: This specifies the minimum penetration depth that is applied to a

stroke, even if the variance control reduces penetration below that level

l Depth Jitter: The Depth Jitter setting allows you to vary the depth that is applied to the

texture as the brush stroke is being created Increasing this value can give the texture a much more dramatic appearance

l Control: The Control setting defines what input is used in determining the variance

applied by the depth texture setting Setting the Control to Fade allows you to specify how many steps the depth texture variance is applied over The other settings allow you to use the pen pressure, tilt, rotation, or stylus wheel values to control the depth variance that is applied

Dual Brush

The Dual Brush option allows you to use two brushes at the same time to apply each stroke

Using the Dual Brush option can add a whole new level of dynamics to your brushing tech-niques When the Dual Brush option is selected, the Brush panel dialog box changes to allow you to select the second brush You also can select the blending mode used to combine the two brush strokes before they are applied together to the image Additionally, you can set the size, spacing, scatter, and count to use in the second brush

Color Dynamics

The Color Dynamics option, shown in Figure 16.25, provides a dynamic coloring effect by chang-ing the brush stroke from the foreground to the background color as you apply the brush stroke

Using the Color Dynamics option allows you to essentially paint with two colors at the same time

The Foreground/Background Jitter setting controls the jitter between the foreground and back-ground color A value of 0 percent applies only the foreback-ground color A larger value means more jitter between the two colors

The variance between the foreground and background colors is adjusted using the Control setting

The Control setting defines what input is used in determining the variance between the foreground

and background colors Setting the Control to Fade allows you to specify how many steps the color variance is applied over The other settings allow you to use the pen pressure, tilt, rotation, or sty-lus wheel values to control the color variance that is applied

You also can vary the hue, saturation, brightness, and purity in the colors by adjusting the sliders

in Figure 16.25

FIGURE 16.25

Setting the color dynamics options of the brush tip

Transfer

The Transfer option, shown in Figure 16.26, gives you an additional level of control over how the brush stroke is applied to the pixels below by varying settings such as wetness, flow, and opacity

The Transfer option really has two modes: one for painting/editing brushes and one for the Mixer Brush tool

When you have a painting or editing brush selected, you can use the Transfer option to set an amount of Opacity Jitter and Flow Jitter that occurs when applying the brush strokes Increasing the Opacity Jitter and Flow Jitter varies the intensity of the brush stroke and thus varies the effect

of the painting tool in a dynamic way

The variance in all the Transfer controls is adjusted using the Control setting The Control setting defines what input is used in determining the variance in each transfer setting Setting the Control

to Fade allows you to specify how many steps the variance is applied over The other settings allow you to use the pen pressure, tilt, rotation, or stylus wheel values to control how the variance is applied

FIGURE 16.26

Setting the transfer options of the brush tip

Brush Presets panel

As you can see from the previous section, the options in configuring the shape and behavior of brushes are limitless This makes the ability to save brush settings a critical part of using the paint-ing features in Photoshop

The Brush Presets panel, shown in Figure 16.27, displays a list of the preset brushes with their cor-responding brush stroke preview The Brush panel menu also allows you to set the preview mode

to text only; small, medium, or large thumbnails; and small or large thumbnail lists You also can select one of the many sets of preset brush lists from the panel menu Brush presets can be added, renamed, and removed from the current list using the buttons at the bottom of the panel menu

The panel menu provides the following options to manage the brushes that are applied to the pre-sets list:

l Reset Brushes: This resets the preview list to the Photoshop default.

l Load Brushes: This launches a dialog box to load a saved set of brushes from a file The

new set is added to the existing set

l Save Brushes: This launches a dialog box to save the current set of brushes as a new

pre-set file This is the best way to permanently organize the brushes you are using

l Replace Brushes: This launches a dialog box to load a saved set of brushes from a file

The new set replaces the existing set

FIGURE 16.27

Managing the preset brush list

Brush panel

Bristle Brush preview

Preset Manager

New Brush Delete Brush

Painting with Non-Brush Painting Tools

In addition to the brush style painting tools listed earlier, Photoshop also provides the Paint Bucket and Gradient tools, shown in Figure 16.28, that allow you to paint large areas of an image with a color, gradient fill, or pattern These tools apply paint using a general filling method rather than individual brush strokes