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July 2007
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2007.07.05 10:56 "Re: 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
On Wed, Jul 04, 2007 at 10:49:58AM -0700, Stephen Carlsen wrote: > I can post some sample files if you like. On one of my images from my > Canon XTi, exported from DNG to uncompressed TIFF (using Lightroom), > the uncompressed size is 57.7 MB, but is 68.8 MB with LZW (plus > predictor) compression. > > Flate tended to generally do worse than LZW, and be a lot slower, in > my testing. That is strange, because 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