Adobe Photoshop CS3 - Manual (Page 397)

PHOTOSHOP CS3
User Guide
390
controls how much the tonal values of neighboring pixels must diverge from the center pixel value before being part
of the blur. Pixels with tonal value differences less than the Threshold value are excluded from the blur.
Brush Stroke filters
Like the Artistic filters, the Brush Stroke filters give a painterly or fine-arts look using different brush and ink stroke
effects. Some of the filters add grain, paint, noise, edge detail, or texture. All the Brush Stroke filters can be applied
through the Filter Gallery.
Accented Edges Accentuates the edges of an image. When the edge brightness control is set to a high value, the
accents resemble white chalk; when set to a low value, the accents resemble black ink.
Angled Strokes Repaints an image using diagonal strokes, with lighter and darker areas painted in strokes going in
opposite directions.
Crosshatch Preserves the details and features of the original image while adding texture and roughening the edges
of the colored areas with simulated pencil hatching. The Strength option (with values from 1 to 3) determines the
number of hatching passes.
Dark Strokes Paints dark areas with short, tight, dark strokes, and lighter areas with long, white strokes.
Ink Outlines Redraws an image with fine narrow lines over the original details, in pen-and-ink style.
Spatter Replicates the effect of a spatter airbrush. Increasing the options simplifies the overall effect.
Sprayed Strokes Repaints an image, using its dominant colors, with angled, sprayed strokes of color.
Sumi-e Paints an image in Japanese style, as if with a fully saturated brush applied to rice paper. Sumi-e creates soft,
blurred edges with rich, inky blacks.
Distort filters
The Distort filters geometrically distort an image, creating 3D or other reshaping effects. Note that these filters can
be very memory intensive. The Diffuse Glow, Glass, and Ocean Ripple filters can be applied through the Filter
Gallery.
Diffuse Glow Renders an image as though it were viewed through a soft diffusion filter. The filter adds see-through
white noise, with the glow fading from the center of a selection.
Displace 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 up by its
corners.
Glass Makes an image appear as if it were 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.
Lens Correction The Lens Correction filter fixes common lens flaws such as barrel and pincushion distortion,
vignetting, and chromatic aberration.
Ocean Ripple Adds randomly spaced ripples to the surface of the image so that it appears to be underwater.
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—an art form popular in the 18th century—
in which the distorted image appears normal when viewed in a mirrored cylinder.