LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
July 2007
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
2007.07.05 17:58 "Re: 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
Separating 16-bit data into byte planes before compressing seems to be very effective. I get 40,882,548 bytes using the simple approach of applying LZW (with predictor) to the high byte plane and no compression on the low one. -rw-r--r-- 1 sc sc 60483984 Feb 15 09:20 IMG_2948.Flowers1.tif -rw-r--r-- 1 sc sc 40882548 Feb 28 14:25 Flowers1.Zap0.BP.LZW+NONE.tif Best regards, Stephen At 2:56 PM +0400 7/5/07, Andrey Kiselev wrote: >...I am usually have good results with Defalate. >For your file I have: > > $ tiffcp -c zip:2 -r 2592 IMG_2948.Flowers1.tif IMG_2948.Flowers1-zip2.tif > $ ls -l IMG_2948.Flowers1* > -rw-r--r-- 1 dron dron 60483984 2007-07-04 22:31 IMG_2948.Flowers1.tif > -rw-r--r-- 1 dron dron 48096986 2007-07-05 14:38 > IMG_2948.Flowers1-zip2.tif > >So we got 25% here, that is quite good result I think. > >Best regards, >Andrey > >-- >Andrey V. Kiselev >ICQ# 26871517