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Precomp - Nice tool

Thundik81 at 2006-09-12 08:41
Today i've discovered a new soft : Precomp by Christian "schnaader" Schneider.

The idea is not new : unzip content of filetypes using LZ77 (zip, png, pdf, ...) and recompress with a better algo.

Link : http://schnaader.info/coding/precomp/precomp.html
Thundik81 at 2006-09-12 09:02
PngSuite.zip : 110,977 bytes.

You can do better with good old LZ77 thanks to your tools (and DeflOpt from Ben Jos Walbeehm). :wink:

With PNGOUTWin + DeflOpt + ZipMax (KZip&7-Zip&DelfOpt) : 97,066 bytes (13,911 bytes saved) :lol:
markcramer at 2006-09-12 22:07
And pngout /s4 (+irfanview don't compress for the 16bit/pix images) and Tar and Kzip and Deflopt gets it down to 60486 bytes (59k+)

(But then Uharc on the uncompressed versions of the Pngsuite Pngs comes out at <31k)

BTW, I've found that Precomp doesn't seem to be able to handle files output by Pngout, it can't find the right recompression parameters, so it don't do much, beyond adding a header to the Png.

mark
counting_pine at 2006-09-12 22:34
Precomp looks like an interesting program, but I'm having trouble working out what exactly it does. The pcf file just seems to be the original file with a header attached. Can someone give me an example of how to use it?