- 2007.07.03 19:04 "Re: [Tiff] BigTIFF extension?", by Stephen Carlsen
-
2007.07.03 19:09 "Re: [Tiff] BigTIFF extension?", by Bob Friesenhahn
-
2007.07.04 15:58 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
- 2007.07.04 11:37 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
-
2007.07.04 17:13 "[Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
-
2007.07.04 17:24 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
-
2007.07.04 17:26 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
-
2007.07.04 17:49 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
- 2007.07.04 18:00 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
- 2007.07.04 20:37 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
-
2007.07.05 10:56 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
- 2007.07.05 12:03 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
-
2007.07.05 17:58 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
- 2007.07.04 18:02 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
- 2007.07.05 18:30 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
- 2007.07.06 01:46 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Chris Cox
-
2007.07.04 17:49 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
-
2007.07.04 17:26 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
- 2007.07.04 17:28 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Michael Wolf
- 2007.07.04 17:36 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrew Brooks
-
2007.07.04 17:24 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
-
2007.07.04 15:58 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
- 2007.07.03 19:17 "Re: [Tiff] BigTIFF extension?", by Andy Cave
- 2007.07.04 11:53 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
-
2007.07.04 20:52 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.04 21:04 "Re: [Tiff] BigTIFF extension", by Toby Thain
-
2007.07.05 05:07 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.05 08:09 "Re: [Tiff] BigTIFF extension", by Andy Cave
-
2007.07.05 13:40 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.05 21:00 "Re: [Tiff] BigTIFF extension", by Chris Cox
- 2007.07.05 21:19 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.05 22:13 "Re: [Tiff] BigTIFF extension", by Bob Friesenhahn
-
2007.08.06 22:48 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Chris Cox
- 2007.08.06 22:32 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Chris Cox
-
2007.08.06 22:48 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Chris Cox
- 2007.07.06 12:36 "Re: [Tiff] BigTIFF extension", by Gary McGath
-
2007.07.05 21:00 "Re: [Tiff] BigTIFF extension", by Chris Cox
-
2007.07.05 13:40 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.05 08:09 "Re: [Tiff] BigTIFF extension", by Andy Cave
-
2007.07.05 16:26 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.05 04:19 "RE: [Tiff] BigTIFF extension", by Kemp Watson
-
2007.07.04 16:56 "[Tiff] BigTIFF extension", by Kemp Watson
-
2007.07.04 17:35 "Re: [Tiff] BigTIFF extension", by Andrew Brooks
- 2007.07.04 18:13 "Re: [Tiff] BigTIFF extension", by John Aldridge
-
2007.07.04 18:25 "Re: [Tiff] BigTIFF extension", by Phil Harvey
- 2007.07.04 18:52 "Re: [Tiff] BigTIFF extension", by Toby Thain
- 2007.07.04 19:17 "Re: [Tiff] BigTIFF extension", by Frank Warmerdam
- 2007.07.05 20:31 "Re: [Tiff] BigTIFF extension", by Chris Cox
- 2007.07.05 15:14 "[Tiff] BigTIFF - Aware Aperio version diff", by Kemp Watson
-
2007.07.04 17:35 "Re: [Tiff] BigTIFF extension", by Andrew Brooks
- 2007.07.05 04:54 "RE: [Tiff] BigTIFF extension", by Stephen Carlsen
- 2007.07.05 16:32 "RE: [Tiff] BigTIFF extension", by Kemp Watson
-
2007.07.04 16:56 "[Tiff] BigTIFF extension", by Kemp Watson
- 2007.07.05 18:56 "Re: [Tiff] BigTIFF extension", by Toby Thain
-
2007.07.05 04:19 "RE: [Tiff] BigTIFF extension", by Kemp Watson
-
2007.07.05 05:07 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
-
2007.07.05 10:06 "Re: [Tiff] BigTIFF extension", by John Aldridge
-
2007.07.05 13:23 "[Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Gary McGath
-
2007.07.05 13:56 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Joris Van Damme
-
2007.07.05 14:14 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Gary McGath
- 2007.07.05 14:39 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Joris Van Damme
- 2007.07.05 15:26 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Andrey Kiselev
-
2007.07.05 14:14 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Gary McGath
-
2007.07.05 13:56 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Joris Van Damme
-
2007.07.05 13:23 "[Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Gary McGath
- 2007.07.05 16:51 "Re: [Tiff] BigTIFF extension", by Andrew Brooks
- 2007.07.09 16:11 "Re: [Tiff] BigTIFF extension", by Stephen Carlsen
-
2007.07.04 21:04 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 15:08 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
Actually, I used quite small tiles - not something I normally do. For 1 bit data, larger tiles are better (but then there's more repeatability). In this case I used tiles approx 40x128 and lzw'd it as a stream. Unless I made a mistake, it compresses to around 20M or thereabouts. That was RGB interleaved 16 bit data - no messing about splitting it or anything.
I found that each tile compressed by around 50%+. I presume that was because the LZW code uses 9 or 10 bits for more data and also finds more repeated strings.
Can you repeat your below test with BLOCKXSIZE=40 and BLOCKYSIZE=128?
Best Regards,
Andy.
----- Original Message -----
On Thu, Jul 05, 2007 at 01:03:07PM +0100, Andy Cave wrote:
I can easily do much better than that - 60:48. I can get ~21276876 (~20M) and with some more work I think I can get down to 15-20M.
Really? But how?
Andrey - since you have tiffcp built, can you repeat your test, but produce tiled output? LZW and Flate. I think you'll find you get what
Actually I did that --- without much success, so I have not listed these
results. The full results:
Original 60483984
ZIP, predictor 2 48095962
ZIP, predictor 2, separated 49303374
ZIP, predictor 2, tiled 47528554
ZIP, predictor 2, tiled, separated 49347802So we can get better results with tiling, but nothing serious. Band
separation doesn't help at all (though, I also thought that it should
help). Those, who want reproduce this tests should get the GDAL library
and use tool called gdal_translate, because tiffcp does not support band
separation for 16-bit images. The command line to get tiled separated
image is:
$ gdal_translate -co "COMPRESS=ZIP" -co "PREDICTOR=2" -co "TILED=YES" -co "BLOCKXSIZE=256" -co "INTERLEAVE=BAND" IMG_2948.Flowers1.tif IMG_2948.Flowers1-zip2-tiled-sep.tif