If you have an ascii file that only have a few digits in the numbers (~7 significant digits), you are better off using single precision (float array) which is 4 bytes.<br><br><div class="gmail_quote">On Thu, Jul 26, 2012 at 11:11 AM, David E DeMarle <span dir="ltr"><<a href="mailto:dave.demarle@kitware.com" target="_blank">dave.demarle@kitware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Thu, Jul 26, 2012 at 5:42 AM, Zenker, Dr. Matthias<br>
<<a href="mailto:Matthias.Zenker@erbe-med.com">Matthias.Zenker@erbe-med.com</a>> wrote:<br>
> Hi,<br>
><br>
> I need to convert legacy vtk files to vtr files. The vtk files are in ASCII<br>
> format and approx. 17 MB large. When I use binary or ASCII as data mode, I<br>
> get a file size of approx. 28 MB. When I use appended data mode without<br>
> encoding, it’s 20 MB. When I use encoding with ZLib compressor (there is<br>
> only this one), the shinks to approx. 800 kB! Also data access is a lot<br>
> faster when I load that file in ParaView.<br>
> My questions:<br>
><br>
><br>
> Why does the file grow for most of the modes I have tried?<br>
<br>
</div>Each double in the binary file is 8 bytes. In ascii, the size depends<br>
on the number of characters, which can be more or less than that. On<br>
my machine I see the same counterintuitive result, the binary is<br>
larger.<br>
<div class="im"><br>
> Is the ZLib compression used in ParaView lossless, or do I lose information<br>
> when I apply it?<br>
<br>
</div>lossless.<br>
<div class="im"><br>
><br>
><br>
> Thanks for some explanations…<br>
><br>
> Matthias<br>
><br>
><br>
><br>
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</blockquote></div><br>