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329
Adobe Photoshop Help
Applying Filters for Special Effects
Using Help
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Contents
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329
Distort filters
The Distort filters geometrically distort an image, creating 3D or other reshaping effects.
Note that these filters can be very memory intensive.
Diffuse Glow
Renders an image as though it were viewed through a soft diffusion filter.
The filter adds see-through white noise to an image, with the glow fading from the center
of a selection.
Displace filter
Uses an image, called a
displacement map
, to determine how to distort a
selection. For example, using a parabola-shaped displacement map, you can create an
image that appears to be printed on a cloth held at its corners.
This filter creates displacement maps, using a flattened file saved in Adobe Photoshop
format (except Bitmap mode images). You can also use the files in the Plug-Ins/
Displacement Maps folder in the Photoshop program folder.
To use the Displace filter:
1
Choose Filter > Distort > Displace.
2
Enter the scale for the magnitude of the displacement.
When the horizontal and vertical scale are set to 100%, the greatest displacement is
128 pixels (because middle gray produces no displacement).
3
If the displacement map is not the same size as the selection, choose how the map will
fit the image—Stretch to Fit to resize the map, or Tile to fill the selection by repeating the
map in a pattern.
4
Choose Wrap Around or Repeat Edge Pixels to determine how undistorted areas of the
image will be treated. (See
“Defining undistorted areas” on page 323
.)
5
Click OK.
6
Select and open the displacement map. The distortion is applied to the image.
The Displace filter shifts a selection using a color value from the displacement map—
0 is the maximum negative shift, 255 the maximum positive shift, and a gray value of 128
produces no displacement. If a map has one channel, the image shifts along a diagonal
defined by the horizontal and vertical scale ratios. If the map has more than one channel,
the first channel controls the horizontal displacement and the second channel controls
the vertical displacement.
Glass
Makes an image appear as if it is being viewed through different types of glass.You
can choose a glass effect or create your own glass surface as a Photoshop file and apply it.
You can adjust scaling, distortion, and smoothness settings. When using surface controls
with a file, follow the instructions for the Displace filter. For more information about Glass
filter controls, see
“Using texture and glass surface controls” on page 323
.
Ocean Ripple
Adds randomly spaced ripples to the image’s surface, making the image
look as if it were under water.
Pinch
Squeezes a selection. A positive value up to 100% shifts a selection toward its
center; a negative value up to –100% shifts a selection outward.
Polar Coordinates
Converts a selection from its rectangular to polar coordinates, and
vice versa, according to a selected option. You can use this filter to create a cylinder
anamorphosis—art popular in the 18th century—in which the distorted image appears
normal when viewed in a mirrored cylinder.
