This code was written based on a template by John Resig. The original can be found at John Resig’s addEvent function website.
In computer graphics, a color look-up table, or CLUT, is the set of available colors for a given application.
For example, a 24-bit system can display 16 million unique colors, but a given program would use only 256 of them at a time if the display is in 256-color mode. The CLUT in this case would consist of the 16 million colors, but the program’s palette would contain only the 256-color subset. To avoid dithering (i.e., varying the pattern of dots in an image) on 8-bit machines, you should only use colors from a predesignated CLUT.
A grayscale image uses only shades of gray to represent an image.
Black-and-white photographs can use a virtually unlimited number of shades of gray, but most computers can display only 16 or 256. To grayscale is to convert a continuous-tone image, like a black-and-white photograph, to an image made up of pixels. Grayscaling is different from dithering, which uses either black or white pixels next to one another to simulate shades of gray. In grayscaling, each individual pixel can be a different shade of gray.
NetCaster was Netscape Communicator’s push delivery system. It was basically a web environment that is always active and can update its onscreen appearance without going to a new URL or reloading. Like all push mechanisms, NetCaster doesn’t require the user to manually check for new content or sit through an update. It let the developer put new content in front of users instead of hoping they come looking for it.
The Netscape Communicator browser ceased development in 2002.
Conceptually, plug-ins are like Lego toys. They are software modules that add a specific feature or service to a larger system. A Lego wheel by itself isn’t that fun, but add that wheel to a Lego car, and you’re cooking with gas. Unfortunately, most plug-ins, whether for browsers or graphics programs, don’t provide as much functionality as a Lego wheel. For example, there are number of plug-ins for the Netscape Navigator browser that enable it to display different types of audio or video messages based on MIME types. However, if nobody develops those kinds of files, the plug-in is useless. There are some cool plug-ins for graphics programs, the best of which is Kai’s Power Tools. That adds a zillion effects that you can use on your images. By the way, in Photoshop you can activate plug-ins by holding down the command and shift keys when starting up the program.