woody@chinacat.Unicom.COM (Woody Baker @ Eagle Signal) (01/15/91)
I have finaly gotten a copy of the RED BOOK II. After perusing the sections on filters, I have some specific questions. Filters are constructed by a filter operator. one of the arguements is the name of the filter. The Red book gives the names of the built-in filters, but does not address the problem of how to add user filters. Can one create a procedure, and register it as a filter using the filter operator? If so, in order to get the raw binary data, do you need to stack the binary filter underneath it? It would really be a shame not to be able to create your own filters. Secondly, does Adobe have any plans to, or have they released 'C' routines to build file streams that are compatable with their filters? Specificaly the LZW, JPEG and CCITT filters? I would think that it would be in thier best interest to do so, in order to avoid end user problems. There are some assumptions made in the JPEG filter, by Adobe that are not really documented. In addition, there is no reference as to where to find the info for the filter routines. Cheers Woody