#CIS/Unysis GIF scam
10-Jan-95 17:14:22
Sb: #181350-#CIS/Unysis GIF scam
Fm: Eduard Joseph 74603,3262
To: John Draper 76703,4322
Sorry to ask but where are you getting this. YES, there is a lossless
compression in the JPEG format it is descrived in the JPEG specs it is coded in
the JPEGproc = 14 (consistant with the ISO DIS 10918-2). The lossy compression
very popular out there uses JPEGproc = 1.
The lossless compression uses a special prediction algoritm.
The one thing it can not have is DCT algorithms since they add error (making
it always lossy).
This has been in available at least since late 1992. And is no secret. It is
also explained in the TIFF 6.0 specs (which is used for its JTIFF) which have
been available since June, 1992.
Where have you been looking they are not HIDDEN at all it has it's own section,
JPEG code, you name it. 🙂
Eduard Joseph