Wasn't the Ziv coding the basis of GIF? Those files were a bugger to
convert, GDI and GDI+ aren't happy with them at all; if you do convert the
sods, the code is so badly written it leaves hanging references all over the
shop, so you have to shut down the application that did the conversion to
clear the space(this is in the case of overwrites).
That's the windows story anyway.
RLE- now that's a fine system.
I ran comparitive tests on near-binary and full greyscale images. The
near-binaries shoed 80% compression, which was good.
But the greyscale? Oh, dear, oh dear, oh dear.
Simon
- Original Message -
From: Ralph Corderoy ra...@inputplus.co.uk
To: Dorset Linux User Group dorset@mailman.lug.org.uk
Sent: Sunday, March 21, 2010 7:13 PM
Subject: Re: [Dorset] OT: Sign up to oppose the Digital Economy Bill
Hi John,
On Saturday 20 March 2010 08:42:27 Terry Coles wrote:
has any one ever found an innovative software patent?
Wasn't Lempel-Ziv innovative, in its time ?
Was it? It's basically the bytes from here on are the same as the N
bytes from M bytes ago, followed by this new bit: `...'. Seems a
pretty obvious way of compressing? An interesting twist is that N can
be larger than M, e.g. output five bytes starting from two bytes back,
so the bit being copied overlaps the destination, but other than that.
Yes, I know. Easy to say that's obvious once it's explained, but I'm
still don't think it was patent-worthy.
Now, Huffman coding, that could be.
Cheers,
Ralph.
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