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2000.01.29 01:15 "tiff2ps: G4 compression in PostScript]", by Paul Kaiser
[...]
2000.01.29 16:12 "Re: 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
2000.02.01 04:16 "Re: G4 and DCT documentation [was: tiff2ps: G4 compression in PostScript]", by Tom Lane
2000.01.29 19:27 "Re: tiff2ps: G4 compression in PostScript]", by Stanislav Brabec
2000.01.31 10:45 "Re: tiff2ps: G4 compression in PostScript]", by Martin Bailey
[...]

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