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January 2009
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2009.01.13 21:56 "Re: Libtiff compression ratios", by Toby Thain
On 13-Jan-09, at 4:01 PM, Nick wrote: > Setting TIFFTAG_PREDICTOR to PREDICTOR_HORIZONTAL worked beautifully. > With the predictor running, libtiff's compression ratios reach parity > with Photoshop. > > Increasing the deflate compression ratio to its maximum via > TIFFTAG_ZIPQUALITY had only marginal effects on compression (a 2% > improvement) while tripling the computation time required. > > I appreciate the advice! Perhaps PREDICTOR_HORIZONTAL might make a > good > default value for the libtiff predictor tag? It would restrict compatibility to those readers that implement the predictor. --Toby > Nick > >