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TIFF and LibTiff Mail List Archive

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2011.06.05 12:38 "[Tiff] Questions on TIFF LZW compression", by Thomas Richter
2011.06.05 12:47 "[Tiff] Questions on TIFF LZW compression", by Thomas Richter
2011.06.06 16:17 "Re: [Tiff] Questions on TIFF LZW compression", by Olivier Paquet
2011.06.06 16:55 "Re: [Tiff] Questions on TIFF LZW compression", by Bob Friesenhahn
2011.06.07 16:45 "Re: [Tiff] Questions on TIFF LZW compression", by Thomas Richter
2011.06.07 17:06 "Re: [Tiff] Questions on TIFF LZW compression", by Bob Friesenhahn
2011.06.09 01:27 "Re: [Tiff] Patch for tif_ojpeg version 3.9.5", by Kevin Myers
2011.06.08 22:32 "[Tiff] Patch for tif_ojpeg version 3.9.5", by
2011.06.09 05:34 "Re: [Tiff] Patch for tif_ojpeg version 3.9.5", by Andreas Kleinert

2011.06.06 16:17 "Re: [Tiff] Questions on TIFF LZW compression", by Olivier Paquet

Hi,
    I don't know about the odd bit depths you're asking but this:

On Sun, Jun 5, 2011 at 8:38 AM, Thomas Richter <thor@math.tu-berlin.de> wrote:

  Can the predictor also be specified without LZW compression? It probably
 makes little sense then, but can - for example - the predictor
 be combined with the Fax (CCITT, ITU) compression?

It definitely can be specified. I have some images here with deflate compression and the predictor used. I don't know about fax compression specifically.

  And finally, what about the predictor and tiles? Does the predictor
 predict across tile edges? The specs seem to indicate this, but this
 would also imply that tiles cannot be decompressed independently. Is
 this really the purpose of prediction or are the specs incomplete
 and should I stop prediction at tile boundaries (which makes sense if
 you want to retain the independence of the tiles).

Prediction definitely stops at tile boundaries because we read tiles at random from our files without issues.

I don't know for certain but I would think it also stops as strip boundaries when not using tiles.

Olivier