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June 1994
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1994.06.21 21:38 "Re: CCITT (ITU) Group 4 raw data", by Bill Cattey
The conversion from Group 4 fax is also there. The Group 4 fax decode (which I have been inside of) and presumably the group 4 fax encode (which I take on faith having seen group 3 encode) looks at slightly different (and simpler) header bits, and then calls the Group 3 fax decode (or encode). It's all there in tif_fax3.c -wdc