Halftone

An image made up of tiny dots arranged in a pattern that appears to look like grayscale. Halftone images are coarse and often used in newspapers.

Handheld Scanner

Scanning device where the scanning element is built into a small, handheld unit. The handheld unit is then waved or rolled over the item being scanned.

Handy

The Friendly Pointer! Handy points out the location of the Attachment button in our e-mail tutorial. He’s made up of the Wingdings characters E (E), F (F), G (G) and H (H).

Hard Disk/Hard Drive

A fixed storage device in a computer system. A hard drive consists of a group of inflexible platters coated with a magnetic media material where data can be written or read. The platters spin very quickly within the sealed case of the drive and can store much more than a floppy disk. They are typically 1 GB to 10 GB in size. Modern computer systems have at least one hard drive where the operating system is located that serves as a boot-drive to load the computer functions.

Hardware Resolution

In a flatbed scanner, resolution is expressed in horizontal (left to right) and vertical (up and down) values, 300 x 600 for example. Any scan up to the maximum value of the horizontal resolution is handled completely by the optical sensor of the scanner. Scans above the horizontal rating rely on the micro-stepping motor to make extra samples of the image. The scanner hardware then uses an averaging algorithm to create the higher resolution image.

Highlights

The lightest tones in an image.

Histogram

1. Graphic representation of the levels of brightness in an image. 2. Command in a scanner interface that displays a histogram for the image.

Home Page

Starting page of a web site devoted to a particular person, group, company or subject. Mustek’s home page is at www.pentagonchannel.com.

Hotmail

Free internet-based e-mail service provided by Microsoft.