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<TITLE>JPEG image compression FAQ, part 1/2 - Introduction</TITLE>
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<H1>Introduction</H1>
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Archive-name: jpeg-faq/part1
Posting-Frequency: every 14 days
Last-modified: 21 June 1998
This article answers Frequently Asked Questions about JPEG image compression.
This is part 1, covering general questions and answers about JPEG. Part 2
gives system-specific hints and program recommendations. As always,
suggestions for improvement of this FAQ are welcome.
New since version of 8 December 1997:
* Updated link to Wayne Fulton's scanning-tips page.
This article includes the following sections:
Basic questions:
[1] What is JPEG?
[2] Why use JPEG?
[3] When should I use JPEG, and when should I stick with GIF?
[4] How well does JPEG compress images?
[5] What are good "quality" settings for JPEG?
[6] Where can I get JPEG software?
[7] How do I view JPEG images posted on Usenet?
More advanced questions:
[8] What is color quantization?
[9] What are some rules of thumb for converting GIF images to JPEG?
[10] Does loss accumulate with repeated compression/decompression?
[11] What is progressive JPEG?
[12] Can I make a transparent JPEG?
[13] Isn't there a lossless JPEG?
[14] Why all the argument about file formats?
[15] How do I recognize which file format I have, and what do I do about it?
[16] What other common compatibility problems are there?
[17] How does JPEG work?
[18] What about arithmetic coding?
[19] Could an FPU speed up JPEG? How about a DSP chip?
[20] Isn't there an M-JPEG standard for motion pictures?
[21] What if I need more than 8-bit precision?
[22] How can my program extract image dimensions from a JPEG file?
Miscellaneous:
[23] Where can I learn about using images on the World Wide Web?
[24] Where are FAQ lists archived?
This article and its companion are posted every 2 weeks. If you can't find
part 2, you can get it from the news.answers archive at rtfm.mit.edu
(See <A NAME=id HREF="faq-doc-24.html" tppabs="http://www.cis.ohio-state.edu/hypertext/faq/usenet/jpeg-faq/part1/faq-doc-24.html">[24] Where are FAQ lists archived?</A>). Part 2 changes very frequently;
get a new copy if the one you are reading is more than a couple months old.
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