LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
September 2005
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2005.09.23 22:20 "Re: Additional Lossless Compression Schemes", by Chris Cox
At 5:11 PM -0400 9/23/05, Frank Warmerdam wrote: > > I was wondering if there is much interest in adding more lossless > compression schemes in libtiff. > > In addition to Packbits (pretty crappy) we have LZW and the more > recent Deflate. My understanding is that Deflate is usually better than > the old LZW though not as widely supported. Also, that Deflate > is essentially the "zip" compression type. Yes, yes, and yes. > Since then I have seen "gzip" on Unix, but I am not clear if that > is just deflate or not. > > Then came bzip2 which seem 5-10% better in that gzip on many > datasets. Since TIFF supports predictors, it can already do better than straight deflate. > Now looking around a bit I see LZMA which I have heard good things > about. > > http://www.7-zip.org/sdk.html > > Are there any opinions on possibly incorporating LZMA as an > additional compression type? Possibly - but it'll take a while to check the legal implications, get a couple of implementations going for cross testing, etc. And I'd expect it to be at least 10% better than deflate to be worth the effort... Chris