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June 2011
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2011.06.06 16:17 "Re: 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