Cisco Cisco StadiumVision Mobile Streamer Licensing Information

The file format we have adopted is called JFIF (see REFERENCES).  This format 

has been agreed to by a number of major commercial JPEG vendors, and it has 

become the de facto standard.  JFIF is a minimal or "low end" representation. 

We recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF 

Technical Note #2) for "high end" applications that need to record a lot of 

additional data about an image.  TIFF/JPEG is fairly new and not yet widely 

supported, unfortunately. 

 

The upcoming JPEG Part 3 standard defines a file format called SPIFF. 

SPIFF is interoperable with JFIF, in the sense that most JFIF decoders should 

be able to read the most common variant of SPIFF.  SPIFF has some technical 

advantages over JFIF, but its major claim to fame is simply that it is an 

official standard rather than an informal one.  At this point it is unclear 

whether SPIFF will supersede JFIF or whether JFIF will remain the de-facto 

standard.  IJG intends to support SPIFF once the standard is frozen, but we 

have not decided whether it should become our default output format or not. 

(In any case, our decoder will remain capable of reading JFIF indefinitely.) 

 

Various proprietary file formats incorporating JPEG compression also exist. 

We have little or no sympathy for the existence of these formats.  Indeed, 

one of the original reasons for developing this free software was to help 

force convergence on common, open format standards for JPEG files.  Don't 

use a proprietary file format! 

 

 

TO DO 

===== 

 

The major thrust for v7 will probably be improvement of visual quality. 

The current method for scaling the quantization tables is known not to be 

very good at low Q values.  We also intend to investigate block boundary 

smoothing, "poor man's variable quantization", and other means of improving 

quality-vs-file-size performance without sacrificing compatibility. 

 

In future versions, we are considering supporting some of the upcoming JPEG 

Part 3 extensions --- principally, variable quantization and the SPIFF file 

format. 

 

As always, speeding things up is of great interest. 

 

Please send bug reports, offers of help, etc. to jpeg-info@uunet.uu.net. 

 

Apache License  

Version 2.0, January 2004  

http://www.apache.org/licenses/  

  

TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION