To produce their effects, some filters load and use other images, such as textures and displacement maps. These filters include the Conté Crayon, Displace, Glass, Lighting Effects, Rough Pastels, Texturizer, Underpainting, and Custom filters. Not all of these filters load images or textures in the same way.
The Rough Pastels, Underpainting, Glass, Conté Crayon, and Texturizer filters have texturizing options. These options make images appear as if they were painted onto textures such as canvas and brick, or viewed through surfaces such as glass blocks or frosted glass.
The Displace, Shear, and Wave filters in the Distort submenu and the Offset filter in the Other submenu let you treat areas undefined (or unprotected) by the filter in the following ways:
Repeat Edge Pixels
Extends the colors of pixels along the edge of the image in the direction specified. Banding may result if the edge pixels are different colors.
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.
The filter creates displacement maps using a flattened file saved in Adobe Photoshop format. (Bitmap mode images are unsupported.)
Enter a screen-angle value (the angle of the dot from the true horizontal) for one or more channels:
For Grayscale images, use only channel 1.
For RGB images, use channels 1, 2, and 3, which correspond to the red, green, and blue channels.
For CMYK images, use all four channels, which correspond to the cyan, magenta, yellow, and black channels.
Click Defaults to return all the screen angles to their default values.
Blocks creates objects with a square front face and four side faces. To fill the front face of each block with the average color of the block, select Solid Front Faces. To fill the front face with the image, deselect Solid Front Faces.
Pyramids creates objects with four triangular sides that meet at a point.