CHAPTER 10
178
Applying Filters, Effects, and Layer Styles
• Material determines whether the light or the
object on which the light is cast reflects more
light. Plastic reflects the light’s color; Metallic
reflects the object’s color.
• Exposure increases the light (positive values) or
decreases 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, or a value of
–100 to completely diffuse the light source. To
change the color of the ambient light, click the
color box and use the Color Picker that appears.
9 To use a texture map, choose a color or layer
from the Texture Channel pop-up menu.
The Texture Channel option lets you manipulate
how light reflects off an image. You can create a
texture effect based on the light and dark areas of
the red, green, and blue color information in your
image. You can also choose to use the layer trans-
parency of the active layer to create a texture effect.
10 Select White Is High to raise the light parts of
the channel from the surface. Deselect this option
to raise the dark parts.
11 Drag the Height slider to vary the depth of the
texture from Flat (0) to Mountainous (100).
12 Click OK.
Adjusting omni lights, directional lights,
and spotlights
You can choose from several light types.
• Omni shines light in all directions from directly
above the image—like a light bulb over a piece
of paper.
• Directional shines light from one angle—like
the parallel light rays of the sun.
• Spotlight casts an elliptical beam of light. The
line in the preview window defines the light
direction and angle, and the handles define the
edges of the ellipse.
To adjust an Omni light:
Do any of the following:
• To move the light, drag the center circle.
• To increase or decrease the size of the light (like
a light moving closer or farther away), drag one
of the handles defining the edges of the light.
To adjust the angle and height of the Directional light
using the preview window:
Do any of the following:
• To move the light, drag the center circle.
• To change the direction of the light, drag the
handle at the end of the line to rotate the light’s
angle. Ctrl-drag (Windows) or Command-drag
(Mac OS) to keep the light’s height constant.
• To change the light’s height, drag the handle at
the end of the line. Shorten the line for a bright
light, lengthen it for a less intense one. A very
short line produces pure white light, a very long
one no light. Shift-drag to keep the angle
constant and change the light’s height (line
length).
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