malak@halluc.FIDONET.ORG (Michael Malak) (02/05/91)
Where is it I can request a copy of the JPEG specification? I'd like to get a copy within a week if that's possible, as I'm up against a deadline for a paper I'm writing for the IEEE data compression conference. If that's impossible, perhaps someone can give me anwer my main question: what provisions, if any, does JPEG have for 8-bit images (with look-up-table)? -- Michael Malak -- sysop of Hallucination (FidoNet node 1:109/345) UUCP: ...!uunet!halluc!malak INTERNET: malak@halluc.FIDONET.ORG
dolf@fwi.uva.nl (Dolf Starreveld) (02/06/91)
malak@halluc.FIDONET.ORG (Michael Malak) writes: > Where is it I can request a copy of the JPEG specification? I'd like to > get a copy within a week if that's possible, as I'm up against a > deadline for a paper I'm writing for the IEEE data compression > conference. > If that's impossible, perhaps someone can give me anwer my main > question: what provisions, if any, does JPEG have for 8-bit images (with > look-up-table)? None! However, it is fairly easy, using the lookup table, to change all pixels in an 8x8 sub-image to 24 bit RGB values, compress those using JPEG. The decoder should, upon seeing the display is 8-bit, somehow determine an optimal lookup table and translate the pixels back to indices in this table. --dolf -- Dolf Starreveld Phone: +31 20 592 5056/5022 (FAX: 5155), TELEX: 10262 HEF NL EMAIL: dolf@fwi.uva.nl (dolf%fwi.uva.nl@hp4nl.nluug.nl) SNAIL: Dept. of Math. and Computing Science, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, The Netherlands