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JPEG File Format
| Short Name |
JPEG |
| Long Name |
Joint Photographic Experts Group |
| Typical File Extensions |
.jpeg .jpg .jpe |
| Contains |
Bitmap |
Technically speaking, JPEG
refers to a particular
compression
algorithm:
- The JPEG compression algorithm a
lossy method
of compression that is most
suitable for compressing
TrueColor
photographs and
other continuous tone images.
- For images with sharp changes in tone,
the format is less suitable and can
introduce artifacts
into the images.
- In JPEG compression, it is possible to control
the amount of data lost by the compression process. In many
software applications, you will find an option to
control the Quality
of the Save process:
- Generally, a higher quality will result in less
data loss, and fewer artifacts
introduced into the image, but at the cost of higher file size.
- Generally, a lower quality will result in more
data loss, a smaller file size, but more
artifacts
introduced into the image.
The JPEG compression algorithm is
supported by a number of file formats,
including TIFF,
but for the purposes of this discussion we
need to talk about the JFIF file format.
JFIF stands for "JPEG File Interchange Format"
and is a relatively simple wrapper around a JPEG
compressed image. Somewhat confusingly, many people
(and books) refer to JFIF as "JPEG files".
Thus, when somebody says a file is in "JPEG format"
they actually mean it is a JFIF file containing a JPEG-compressed
image.
JPEG 2000, is a enhanced version of the JPEG system, which
adds a number of features, including better compression,
and an optional lossless compression
mode (which doesn't reduce file sizes as much as the
lossy mode, but preserves the image
exactly). At the time of writing, JPEG 2000 is not especially
widely supported by software applications.
A technical discussion of this format can be found in Chapter 17 of Graphics File Formats† by David C. Kay and John R. Levine. The book does not appear to cover JPEG 2000.
Related Pages on this site:
Related Books:
- Compressed Image File Formats: JPEG, PNG, GIF, XBM, BMP
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| |
By John Miano
Addison-Wesley Professional
Paperback (288 pages)
Product Description:
This comprehensive reference on the major graphics file formats and the compression technologies they employ is an indispensable resource for graphics programmers, especially those developing graphical applications for the Web. Compressed Image File Formats: JPEG, PNG, GIF, XBM, BMP examines the most common graphics file formats in detail and demonstrates how to encode and decode image files for each. In particular, this book offers in-depth coverage of the elaborate JPEG and newer PNG formats, providing clear explanations of complex concepts, experience-based practical techniques, and plentiful code examples. GIF, XBM, and BMP are also covered, with a focus on some of the less familiar and less well-documented features of these common file formats. Specific topics covered include: *Compression technologies that each file format utilizes *Color models employed by each file format *The advantages and disadvantages of each file format *Huffman Coding *LZW Compression *Deflate/Inflate *Progressive JPEG *The Discrete Cosine Transform *Animated GIF The accompanying CD-ROM contains the complete source code for all of the image formats covered in the book, as well as working examples and sample images. If you want to learn how to read and write graphic file formats for the Web--including PNG and JPEG files--there is no better resource than this book. System requirements: Windows 95 or Windows NT, Borland C++ Builder 3, or Microsoft Visual C++ 5.0. 0201604434B04062001
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- Graphics File Formats
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| |
By David C. Kay
Windcrest
Paperback (496 pages)
Product Description:
This text features detailed specifications for 30 popular graphics file formats so that readers can more quickly and easily decide which standards are best for their applications. New to this edition are chapters on formats important to multimedia and video, including MPEG, FL1 and QuickTime; expanded discussion of data compression; and coverage of format updates, such as TIFF 6.0. Readers can also get updated information on: JPEG; GEM bit image; Windows BMP; PostScript; HP PCL; CGM; GIF; Targa; MacPaint; PICT; Windows Metafile; and Lotus PIC. This book should be of interest to software developers, systems managers and computer hobbyists.
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- JPEG: Still Image Data Compression Standard (Digital Multimedia Standards) (Digital Multimedia Standards S.)
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| |
By William B. Pennebaker
Springer
Hardcover (650 pages)
Product Description:
Created by the Joint Photographic Experts Group (JPEG), the JPEG standard is the first color still image data compression international standard. This new guide to JPEG and its technologies offers detailed information on the new JPEG signaling conventions and the structure of JPEG compressed data.
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- JPEG2000: Image Compression Fundamentals, Standards and Practice (The International Series in Engineering and Computer Science)
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| |
Springer
Hardcover (800 pages)
Product Description:
This is nothing less than a totally essential reference for engineers and researchers in any field of work that involves the use of compressed imagery. Beginning with a thorough and up-to-date overview of the fundamentals of image compression, the authors move on to provide a complete description of the JPEG2000 standard. They then devote space to the implementation and exploitation of that standard. The final section describes other key image compression systems. This work has specific applications for those involved in the development of software and hardware solutions for multimedia, internet, and medical imaging applications.
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- JPEG2000 Standard for Image Compression: Concepts, Algorithms and VLSI Architectures
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By Tinku Acharya
Wiley-Interscience
Hardcover (296 pages)
Product Description:
JPEG2000 Standard for Image Compression presents readers with the basic background to this multimedia compression technique and prepares the reader for a detailed understanding of the JPEG2000 standard, using both the underlying theory and the principles behind the algorithms of the JPEG2000 standard for scalable image compression. It introduces the VLSI architectures and algorithms for implementation of the JPEG2000 standard in hardware (not available in the current literature), an important technology for a number of image processing applications and devices such as digital camera, color fax, printer, and scanners.
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- JPEG: Still Image Data Compression Standard (Digital Multimedia Standards) (Digital Multimedia Standards S.)
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| |
By William B. Pennebaker
Springer
Hardcover (650 pages)
Product Description:
Created by the Joint Photographic Experts Group (JPEG), the JPEG standard is the first color still image data compression international standard. This new guide to JPEG and its technologies offers detailed information on the new JPEG signaling conventions and the structure of JPEG compressed data.
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- Internet File Formats: Your Complete Resource for Sending, Receiving, and Using Internet Files
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By Tim Kientzle
Coriolis Group
Paperback (416 pages)
Product Description:
Provides a detailed file format dictionary to help you understand most of the major file formats found on the Internet. Comes with a CD-ROM jam-packed with programs and tools to help you work with the files you come across on the Internet. Includes player programs to use files you download from the Internet. Contains compression and decompression utilities, and utilities to help you convert files from one format to another. Offers the tools to help you create HTML files and publish on the Web, and efficiently transfer your files. Helps you to read, write, convert, and use most of the major file types encountered on the Internet.
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