Glossary

Welcome to the glossary of technical terms. Browse through the alphabetic list to find the term(s) you’re looking for.

WXYZ

Watermark:

A mark put on a photo to identify its owner and make it difficult to reproduce. Used to help protect copyright of images.

Whitepoint:

Adjusting whitepoint in an image restores contrast to the image without affecting the pinkish (flesh tones) in the image.

WMF:

Windows Metafile.

Writable CD:

A compact disc that can be written to if you have a CD writer.

XML (eXtensible Mark-up Language):

XML is a standard to create electronic documents on the Internet. The first application of XML is to create Web pages, similar to existing ones but more dynamic. XML is not limited to only Web pages; potential documents include forms, EDI messages, channel definition (for push technology), application descriptions, etc.

XML Parser:

A parser is a library that reads and interprets XML documents for applications.

X Origin of Image:

The starting point in an image from which pixels are numbered in the horizontal direction. Usually at a corner or at the center of the image.

Y Origin of Image:

The starting point in an image from which to start counting scan-lines. Usually at the top, bottom, or center of the rendered image.

Z-Buffer:

A method used by high end computers to depict depth of objects on a computer screen. The Z-buffer is implemented within the hardware rendering engine of a computer, typically used on 3D modeling computers.

ZIP Compression:

A type of file compression that decreases the total size of a file and allow larger amounts of data to be transferred in fewer bytes. A zip file typically ends with a .zip extension (See WinZip for windows zip compression).

Zip Disk:

A 3.5-inch removable disk available in 100MB and 250MB capacities developed by Iomega Corporation.

Zoom Lens:

A variable length lens that can be adjusted from wide angle to telephoto. The higher the number, the greater the range of the zoom.