NRJ Design Glossary
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Filter

A filter is a program that receives a specified kind of data, then manipulates and outputs the results. Visual filters as a part of dHTML modify the appearance of a control. In fact, a visual filter can have complete authority over the control's visual output. An Alpha filter, for example, can control the opacity of its target, while the author controls the amount of opacity expressed as a percentage. Currently, visual filters are only supported by Microsoft Internet Explorer.

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