Adobe 29180155 - Photoshop Elements 4.0 User Manual page 219

Offset
The Offset filter moves a selection a specified amount to the right horizontally or down vertically, leaving an empty
space at the selection's original location. Depending on the size of the selection, you can fill the empty area with a
transparent background, with the edge pixels, or with pixels from the right or bottom edges of an image.
Custom filters
Custom filters let 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. You can save the custom filters you create and use them
with other Photoshop images.
Use the Save and Load buttons to save and reuse custom filters.
To apply a Custom filter
In the Editor, select an image, layer, or area.
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Choose Other > Custom from the Styles And Effects palette or Filter menu. (If using the palette, select Filter
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Options before applying the filter.)
Select the center text box, which represents the pixel being evaluated. Enter the value by which you want to
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multiply that pixel's brightness value, from -999 to +999.
Select a text box representing an adjacent pixel. Enter the value by which you want the pixel in this position multi-
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plied.
For example, to multiply the brightness value of the pixel to the immediate right of the current pixel by 2, enter 2 in
the text box to the immediate right of the center text box.
Note: To avoid turning the image completely white or black, the sum of the values in the matrix should equal 1.
Repeat steps 3 and 4 for all pixels you want to include in the operation. You don't have to enter values in all the
5
text boxes.
For Scale, enter the value by which to divide the sum of the brightness values of the pixels included in the calcu-
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lation.
For Offset, enter the value to be added to the result of the scale calculation.
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Click OK. The custom filter is applied to each pixel in the image, one at a time.
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See also
"About filters" on page 183
Plug-in filters
You can install plug-in filters developed by non-Adobe software developers. Once installed, the plug-in filters appear
at the bottom of the Filter menu unless the developer has specified another location. For previews to appear in the
Styles And Effects palette, plug-in filters must be specially designed for Photoshop Elements.
If you are interested in creating plug-in modules, contact Adobe Systems Developer Support.
Important: If you have problems or questions about a third-party plug-in, contact the plug-in's manufacturer for
support.
ADOBE PHOTOSHOP ELEMENTS 4.0
User Guide
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