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May 2007

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2007.05.13 17:47 "JBIG2 compressed TIF question about bpp", by T T
2007.05.13 18:27 "Re: JBIG2 compressed TIF question about bpp", by Toby Thain
2007.05.13 18:48 "Re: JBIG2 compressed TIF question about bpp", by T T
2007.05.13 19:22 "Re: JBIG2 compressed TIF question about bpp", by Toby Thain
2007.05.13 22:49 "Re: JBIG2 compressed TIF question about bpp", by T T
2007.05.14 17:18 "Re: JBIG2 in TIFF", by Glenn Widener
2007.05.14 17:55 "Re: JBIG2 in TIFF", by Lee Howard
2007.05.14 21:24 "Re: JBIG2 in TIFF", by Bob Friesenhahn
2007.05.14 23:05 "Re: JBIG2 in TIFF", by Glenn Widener

2007.05.13 17:47 "JBIG2 compressed TIF question about bpp", by T T

Hi everybody,

I've used this site many times before to look up TIFF tags and look at the
TIFF specification.  My question is about a JBIG2-compressed TIF.  Now I
know JBIG2 is a bitonal compression standard, but if you save let's say a
24-bit TIF with JBIG2 compression should it work according to the
specification or do you have to start with a 1-bit TIF first?

I'm using some imaging software and I can successfully start with a 24-bit
TIF and save it as a PDF with JBIG2 compression so it's 1 bit.  But if I
start with a 24-bit TIF and save it as a TIF with JBIG2 compression an
exception is thrown, but if start with a 1-bit TIF and save it as a TIF with
JBIG2 compression it works fine as it should.  I know if you start with a
non 1-bit TIF and save it with G4 compression it will take it to 1-bit
without a problem.

I found a very similar question in the archives here where somebody wanted
to save a non 1-bit TIF with RLE encoding but the TIF specification doesn't
support that and he would have to take it down to 1-bit first to do it.

So is this a problem with the software I'm using or does the TIF
specification not support it?

Thanks,

       
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