2000.01.29 01:15 "tiff2ps: G4 compression in PostScript]", by Paul Kaiser

2000.01.29 17:03 "G4 and DCT documentation [was: tiff2ps: G4 compression in PostScript]", by Tom Kacvinsky

Well, good luck finding out whether Adobe has determined it has to be "this way." If I am not mistaken, the problem with DCTDecode filter in Adobe CPSI is this (from GS's gsjmorec.h):

/*
 * Read "JPEG" files with up to 64 blocks/MCU for Adobe compatibility.
 * Note that this #define will have no effect in pre-v6 IJG versions.
 */
#define D_MAX_BLOCKS_IN_MCU   64

whereas the standard for blocks/MCU is lower (I think). As far as I know, this was (is) undocumented.

Tom Lane and/or L. Peter Deutsch can probably give more details to what I just wrote.

Tom