> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of keith_w > > Perhaps you'll pardon my ignorance, but, how does the > software know what to > add back, and where to put it? >
In some cases it doesn't, because jpeg is a lossy algorithm. However, in general compression techniques find patterns in the source data, and identify the frequency with which they occur. They store the pattern itself & the frequency once in the destination and replace other occurrences with references to the pattern. To reconstruct the original they replace the references with the actual pattern. This is a much simplified explanation! Bob -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
