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·¢ÐÅÈË: killest (ì¶Ü), ÐÅÇø: Graphics
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Using the Lighting Effects filter
The Render > Lighting Effects filter lets you apply
up to 17 different light styles to an RGB image. You
can choose from three different types of lights and
from four sets of properties for each image. You
can also save your own styles for use in other
images.
By varying the number of lights, the light types,
and the light properties, you can produce myriad
lighting effects. You can also use textures from
grayscale files (called bump maps) to produce 3-D-like
lighting effects.
Note: The Lighting Effects filter works only on RGB
images.
To use the Lighting Effects filter:
1 Choose Filter > Render > Lighting Effects.
2 For Style, choose a style. Press Tab to cycle
through the lights in a style. For more informa-tion,
see “Choosing a Lighting Effects style” on
page 294.
3 For Light Type, choose a type. For more infor-mation,
see “Choosing a Lighting Effects type” on
page 292. If you’re using multiple lights, select and
deselect On to turn individual lights on and off.
4 To change the color of the light, click the
color swatch in the Light Type section of
the dialog box.
The color picker chosen in the General Preferences
dialog box opens. For more information, see
“Using the Adobe Photoshop Color Picker” on
page 222, “Using the Apple Color Picker” on
page 225, or “Using the Windows Color Picker” on
page 226.
5 To set light properties, drag the corresponding
slider for the following options: Gloss determines how much the surface reflects
light (as on the surface of a piece of photographic
paper) from Matte (little reflectance) to Glossy
(high reflectance). Material determines whether the light or the
object on which the light is cast reflects more light:
choose Plastic to reflect the light’s color or choose
Metallic to reflect the object’s color.
Click swatch to
select new color
CHAPTER 12 292
Using Filters Exposure increases the light (positive values) or
darkens the light (negative values). A value of 0 has
no effect. Ambience diffuses the light as if it were
combined with other light in a room, such as
sunlight or fluorescent light. Choose a value of 100
to use only the light source; a value of –100
removes the light source. To change the color of
the ambient light, click the color swatch and use
the Color Picker that appears.
To duplicate a light, Option-drag
(Macintosh) or Alt-drag (Windows) the
light within the preview box.
6 To use a texture fill, choose a channel for Texture
Channel. See “Using a Lighting Effects texture” on
page 295.
7 Click OK to apply the filter.
To delete a light:
In the Lighting Effects dialog box, drag the light by
its center circle to the Trash icon at the bottom
right of the preview box.
Choosing a Lighting Effects type
You can choose from three light types. Omni shines in all directions from directly above
the image, as if a light bulb were over a piece of
paper.
Omni light Directional shines light from far away, like the
sun, so that the light angle does not change.
Directional light Spotlight casts an elliptical beam of light. The
line in the preview box defines the light direction
and angle, and four boxes define the edges of the
ellipse.
293
Spotlight
To adjust an Omni light:
1 Choose Filter > Render > Lighting Effects.
2 For Light Type, choose Omni.
3 Choose from the following: To move the light,
drag the center circle. To increase or decrease
the size of the light (as if
the light were moving closer to or farther away
from the paper), drag one of the four boxes, which
define the edges of the effect.
4 Click OK to apply the filter.
To adjust the angle and height of the directional light
using the preview box:
1 Choose Filter > Render > Lighting Effects.
2 For Light Type, choose Directional.
3 Choose from the following: To move the light, drag
the center circle. To change the direction of the light, drag the
black square at the end of the line to rotate the
light’s angle. Command-drag (Macintosh) or
Ctrl-drag (Windows) to keep the light’s height
(line length) constant. To change the light’s height,
drag the square at
the end of the line that represents the height of the
light: Shorten the line to create a very bright light;
if the line gets too short, it produces pure white
light. Lengthen the line for a less intense light; a
very long line produces no light. Shift-drag to keep
the angle constant and change the light’s height
(line length).
4 Click OK to apply the filter.
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