Re: OT: Looking for image file format that can handle 16b its per channel

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#118

From: Oliver Kreylos
Date: Tue, 28 Dec 1999 00:00

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Warren Young wrote:
[snip]
> In defense of PNG's encoding, the only other option suggested here is
> TIFF, which uses a similar compression algorithm to PNG's -- PNG uses
> LZH (?) and TIFF uses LZW.  And let's not forget the Unisys patent on
> LZW: it applies to TIFF just as well as to GIF.

Right. Actually, the encoding mechanism used by PNG is called "deflate",
and it is based on the LZ77 sliding window algorithm and Huffman
encoding of literal/length and distance pairs.

As opposed to LZW, LZ77 is not patented itself; some implementations
using special "tricks" might be. But PNG uses a non-patented
implementation and is thus not endangered as is TIFF/GIF.

  Oliver

-- 
Email: kreylos@cs.ucdavis.edu
WWW:   http://graphics.cs.ucdavis.edu/~okreylos

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From: Oliver Kreylos <kreylos@cs.ucdavis.edu>
Subject: Re: OT:  Looking for image file format that can handle 16b its per  channel
Date: 1999/12/28
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