7zip, rar, and zip with default compression settings. doing or try a different type of compression file. Is there a way in Windows XP Pro to do "Extreme Compression"(turn a 10MB file. Extreme Zip Files, free extreme zip files software downloads Super Maximum and extreme compression software tools Super Maximum and extreme compression software tools I have 2. How does extreme compression work? So I need to compress a directory with max compression. Compression using LZMA2 in 7zip produced quite acceptable results in least amount of time. In the end my conclusion is that when compressing PDF documents containing mostly images, the effort needed to use exotic compression algorithms isn't justified. I tried using other compression algorithms supported by 7zip and PeaZip and they produces files in sizes from 19.8MiB to 21.5MiB. I believe that such savings do justify efforts needed to make two necessary clicks and change word size. Difference between highest word size and smallest was 115,260B.
Increasing word size did produce some results.
Now back to my original question: In my case solid block size didn't produce any noticeable results. Settings used were word size 273, dictionary size 64MB and I used 2 threads for compression. Using it, I got 20,518,802B in about 3 minutes. It also uses around 1.5GiB of RAM with settings I used (a -9 -c)Īfter that was 7-Zip 9.15 beta () using LZMA2. Unfortunately, program is command line only, and not many other programs use that compression algorithm. Using it, I got 20,132,660B in about 3 minutes of compression. Unfortunately, speed of compression was around 5KiB/s, so it took more that one hour to compress data. Settings used were compression level: maximum. My processor is Intel Core 2 Due T8100 and I have 4GiB of ram.īest compression was with PeaZip using PAQ8O algorithm. Here's what I got after testing various compression methods: I need to have some files transfered (~200MiB) over net and upload speeds here are very slow, so I'd want to compress the data as much as possible. Also, would LZMA or PPMd be better options? I'm thinking about using LZMA2, but I don't know what to set in dictionary size, word size, etc.
What settings to use when making 7zip files in order to get maximum compression? I'm compressing PDF documents containing scanned images.
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