Adobe Photoshop CS3 - Manual (Page 402)

PHOTOSHOP CS3
User Guide
395
Texture filters
Use the Texture filters to simulate the appearance of depth or substance, or to add an organic look.
Craquelure Paints an image onto a high-relief plaster surface, producing a fine network of cracks that follow the
contours of the image. Use this filter to create an embossing effect with images that contain a broad range of color or
grayscale values.
Grain Adds texture to an image by simulating different kinds of grain—Regular, Soft, Sprinkles, Clumped,
Contrasty, Enlarged, Stippled, Horizontal, Vertical, and Speckle, available from the Grain Type menu.
Mosaic Tiles Renders the image so that it appears to be made up of small chips or tiles and adds grout between the
tiles. (In contrast, the Pixelate > Mosaic filter breaks up an image into blocks of different-colored pixels.)
Patchwork Breaks up an image into squares filled with the predominant color in that area of the image. The filter
randomly reduces or increases the tile depth to replicate the highlights and shadows.
Stained Glass Repaints an image as single-colored adjacent cells outlined in the foreground color.
Texturizer Applies a texture you select or create to an image.
Video filters
The Video submenu contains the De-Interlace and NTSC Colors filters.
De-Interlace Smooths moving images captured on video by removing either the odd or even interlaced lines in a
video image. You can choose to replace the discarded lines by duplication or interpolation.
NTSC Colors Restricts the gamut of colors to those acceptable for television reproduction, to prevent oversaturated
colors from bleeding across television scan lines.
Other filters
Filters in the Other submenu let you create your own filters, use filters to modify masks, offset a selection within an
image, and make quick color adjustments.
Custom Lets you design your own filter effect. With the Custom filter, you can change the brightness values of each
pixel in the image according to a predefined mathematical operation known as convolution. Each pixel is reassigned
a value based on the values of surrounding pixels. This operation is similar to the Add and Subtract calculations for
channels.
You can save the custom filters you create and use them with other Photoshop images. See “Create a Custom filter”
on page 398.
High Pass Retains edge details in the specified radius where sharp color transitions occur and suppresses the rest of
the image. (A radius of 0.1 pixel keeps only edge pixels.) The filter removes low-frequency detail from an image and
has an effect opposite to that of the Gaussian Blur filter.
It is helpful to apply the High Pass filter to a continuous-tone image before using the Threshold command or
converting the image to Bitmap mode. The filter is useful for extracting line art and large black-and-white areas from
scanned images.
Maximum and Minimum Are useful for modifying masks. The Maximum filter has the effect of applying a choke—
spreading out white areas and choking in black areas. The Minimum filter has the effect of applying a spread—
spreading out black areas and shrinking white areas. Like the Median filter, the Maximum and Minimum filters look
at individual pixels in a selection. Within a specified radius, the Maximum and Minimum filters replace the current
pixel’s brightness value with the highest or lowest brightness value of the surrounding pixels.