High-Res
High Resolution, high-quality reproduction results from using a relatively large number of dots per inch (dpi), e.g., 1024 dpi, in representing (horizontally and vertically) a file's text and/or images onscreen or in print.


HPGL
Hewlett-Packard Graphics Language. Files have this extension: .PLT.
.HQX
A BinHex algorithm file format used to represent nontext MacOS files; such as, formated text, graphic images, sounds, OuickTime movies, and applications with plain text for reliable ASCII transfer by Internet E-mail. This encoding protocol preserves the MacOS's data- and resource-fork file structure.

Process: Convert the file. Copy its BinHex-encoded ASCII text and paste it directly into an E-mail message. When it arrives at its destination, the BinHex code in the unformatted ASCII text can be used to decode the document back into its original format.

If the document is larger than 64K, it may be split into two or more segments by an E-mail server. If so, use a text editor to copy, then paste the segments back together--then use the BinHex decoder.

If a decoded file is corrupted, request that the sender use their encoder to presegment the file into multiple messages, then retransmit it. Using the same algorithm, you should be able to accurately decode it. Use StuffIt Expander, Cyclos's Compact Pro, and HQXer to decode these files. (Note, BinHex 5.0 is proprietary, its documents may not be readable by other BinHex-decoding utilities.) Read BinHex.


.HTM, HTML
Hypertext Markup Language was developed for defining individual internet "Web" pages. HTML is a hypermedia language that can create links (threads) between text, graphics (GIF), sound and motion (JPEG) within a document to other parts of the same document or remote documents on the World-Wide Web (WWW).

HTML "Web publishing" is supported by the Internet Engineering Task Force (IETF) and the World-Wide Web Consortium (W3C). HTML documents are written in unformatted plain text without special characters (curly quotes, accented letters, etc.), although equivalents can be created using special entities codes.

HTML consists of Tag commands which are inserted into a file to indicate how its text will appear in a Web browser. For example, a pair of <H1> tags can be used to define a first-level header (story title): ,<H1>Story Head</H1>. There are many tags, and new ones are defined with some frequency which makes it difficult for Web authoring tools to support all of them. Two example: Table tags, which embed formatted tables; Frame tags whichembed scrolling Web pages in other pages.

CGI (Common Gateway Interface) scripts can create "hot spots" on an image with links to various URL locations. Because it is difficult to precisely control what a person sees onscreen, many Web authoring tools have been developed; among the many are: Howard Harawitz's HTML Assistant, SoftQuad's HoTMetaL, Quarterdeck's WebAuthor, Novell's WordPerfect 6.1 SGML Edition (Standard Generalized Markup Language--which is a superset of HTML), Coriolis Group's Web Surfing and Publishing Kit, Interleaf's Cyberleaf, Iand T Solutions' Web Pages.

HTML tags can be added to Acrobat Exchange PDF documents (created by Adobe's competing Acrobat Exchange) using the Navigator supported Weblink program.

Adobe also includes a HTML Author plug-in for PageMaker 6.0 to convert its documents to HTML format. Other wordprocessing publishers, like Midrosoft Word and WordPerfect have also developed HTML-conversion utilities to work within their applications. Acrobat 3.x can embed HTML code in PDF files. URLs can be embedded in Navigator 3.x e-mail. Windows files must have this extension: .HTM


HTTP
HyperText Transfer Protocol, developed at CERN physics laboratory in Geneva, is used to communicate across the Internet by such World-Wide Web browsers as NCSA Mosaic and Netscape Navigator.
Huffman
Huffman document compression/decompression (codec) format. This statistical lossless encoding method assigns a code to each character/symbol in a data stream based on its probability of occurence. The greater the probability of the character, the shorter the code. It is intended to support networks where the data is predictable and encoding can be optimized. The best implementation is a network with a single application.

Software File Format Compendium
References are samples only. Each one is presented in greater detail in the
Technical Research Assistant for 2001

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