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To adjust the angle and height of the spotlight using
the preview box:
1 Choose Filter > Render > Lighting Effects.
2 For Light Type, choose Spotlight.
3 Choose from the following: To move the light, drag the center circle. To increase or decrease the light angle, drag the
black square at the end of the line to shorten or
lengthen the line, respectively To stretch the ellipse or rotate the light, drag one
of the four boxes. Shift-drag to keep the angle
constant and change only the size of the ellipse.
Command-drag (Macintosh) or Ctrl-drag
(Windows) to keep the size constant and change
the angle or direction of the spotlight. To set the light focus (or spotlight intensity), and
control how much of an ellipse is filled with light,
drag the Intensity slider: Full intensity (a value of
100) is brightest; Normal intensity is about 50; a
negative intensity takes away light; –100 intensity
produces no light. Use the Focus slider to control
how much of the ellipse is filled with light.
4 Click OK to apply the filter.
Choosing a Lighting Effects style
Use the Style menu in the Lighting Effects dialog
box to choose from 17 light styles. You can also
create your own lighting style by adding lights to
the Default setting. The Lighting Effects filter
requires at least one light source. Only one light
can be active for editing at a time, but all of the
lights will be used to create the effect.
Note: The names of these styles are abbreviated in
Windows.
Default One yellow spotlight with a medium
intensity and a wide focus.
2 o’clock Spotlight One yellow spotlight with
medium (17) intensity and wide (91) focus.
Blue Omni One blue overhead omni light with full
(85) intensity and no focus.
Circle of Light A spotlight made up of red, blue,
yellow, and white lights with full (100) intensity
and a concentrated (8) focus.
Crossing A white spotlight with medium (35)
intensity and a concentrated (8) focus.
Crossing Down Two white spotlights with medium
(35) intensity and wide (100) focus.
5 Lights Down/5 Lights Up Five white spotlights
down or up, respectively, with full (100) intensity
and wide (60) focus.
Flashlight An omni yellow light with medium (46)
intensity.
Flood Light A white spotlight with medium (35)
intensity and wide (69) focus.
Parallel Directional A directional blue light with
full (98) intensity and no focus.
295
RGB Lights A red, blue, and green light that
produces a white spotlight of medium (60) inten-sity
and wide (96) focus.
Soft Direct Lights Two unfocused whitish and blue
directional lights of soft (20) intensity.
Soft Omni A soft omni light of medium (50)
intensity.
Soft Spotlight A white spotlight with full (98)
intensity and white (100) focus.
Three Down Three white spotlights with soft (35)
intensity and wide (96) focus.
Triple Spotlight Three spotlights with slight (35)
intensity and wide (100) focus.
To add a light:
In the Lighting Effects dialog box, drag the light
icon at the bottom of the dialog box into the pre-view
area. Repeat as desired for a maximum of 16
lights.
To create a new style:
1 In the Lighting Effects dialog box, choose
Default for Style.
2 Drag the light icon at the bottom of the dialog
box into the preview area. Repeat as desired for a
maximum of 16 lights.
To save a style:
1 In the Lighting Effects dialog box, click Save.
2 Name the style, and click OK.
Saved styles include all the settings for each light
and appear in the Style menu whenever you open
the image.
To delete a style:
1 In the Lighting Effects dialog box, choose a style
for Style.
2 Click Delete.
Using a Lighting Effects texture
The Texture Channel in the Lighting Effects dialog
box lets you use a grayscale texture such as paper
or water to control how light reflects off an image.
You can use a channel from any image as a texture,
or create your own texture, such as 3-D bumps
that bounce light from their surface; the texture
channel sets the height of the bumps. For an
embossed text effect, use a channel with white text
on a black background, or vice versa.
To use the Texture Channel in the Lighting Effects
dialog box:
1 If necessary, create an alpha channel in your
image and add texture to it. To use a texture from
another image, copy and paste the image into a
new channel. For more information, see “Creating
a new alpha channel” on page 238.
2 In the Lighting Effects dialog box, choose a
channel from the Texture Channel menu: the
image’s Red, Green, or Blue channel, or any
channel added to the image.
3 Select White is High to raise the white parts of
the channel from the surface. Turn off this option
to raise the dark parts of the channel from the
surface.
4 Drag the Height slider to vary the texture from
Flat (0) to Mountainous (100).
5 Click OK.
CHAPTER 12 296
Using Filters
Using the Trace Contour Filter
The Stylize > Trace Contour filter finds the transi-tions
of major brightness areas and thinly outlines
them for each color channel, similar to the Find
Edges filter.
To use the Trace Contour filter:
1 Choose Filter > Stylize > Trace Contour.
2 Choose an Edge option to outline areas in the
selection: Lower outlines where the color values of
pixels fall below the specified level; Upper outlines
where the color values of pixels are above the spec-ified
level.
3 Enter a threshold (Level) for evaluating color
values (its tonal level), from 0 to 255. You can
experiment to see what values bring out the best
detail in the image.
4 Use the Info palette in Grayscale mode to iden-tify
a color value that you want traced; then enter
the value in the Level text box. For more informa-tion,
see “Customizing the Info palette” on
page 26.
5 Click OK.
Photoshop Filter Sample Gallery
The following pages show examples of effects
using filters included in Adobe Photoshop. For
additional information on filters, see online help.
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