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July 2007
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2007.07.09 20:13 "Re: 16-Bit-Per-Channel Lossless Compression", by Chris Cox
I'm still researching the best predictors and how they could be incorporated into TIFF. I already added a byte splitting predictor for floating point data in Technote 3 (which still isn't officially published because I still have no other implementation to verify the documented code). Chris -----Original Message----- From: tiff-bounces@lists.maptools.org on behalf of Andrey Kiselev Sent: Mon 7/9/2007 8:35 AM To: tiff@lists.maptools.org Subject: Re: [Tiff] 16-Bit-Per-Channel Lossless Compression On Thu, Jul 05, 2007 at 06:46:18PM -0700, Chris Cox wrote: > processing IMG_2948.Flowers1.pbm > width: 3888, height: 2592, channels: 3, 16 bits per sample > uncompressed size: 60466176 bytes > RGB, no predictor, interleaved, LZW: 72067928 bytes > RGB, no predictor, interleaved, ZIP: 55539057 bytes > RGB, no predictor, planar, LZW: 68826695 bytes > RGB, no predictor, planar, ZIP: 53133761 bytes > YCC1, upLeftMinusMedian diff, bytesplit, planar, ZIP: 27850499 bytes > YCC1, MED diff, bytesplit, planar, ZIP: 27852858 bytes > YCC1, paeth2 diff, bytesplit, planar, ZIP: 27981334 bytes > YCC1, paeth diff, bytesplit, planar, ZIP: 28005222 bytes > YCC1, avgUpLeft diff, bytesplit, planar, ZIP: 28054460 bytes > > All lossless, and I think I can still do better. Chris, Is it possible to add byte splitting as a new predictor type in TIFF? Best regards, Andrey -- Andrey V. Kiselev ICQ# 26871517