sebastien at barre.nom.fr
Wed Nov 1 12:28:50 EST 2000
At 01/11/00 12:15, Michael Halle wrote:
>I know that there's been a long-standing philosophy that vtk is
>easiest maintained when it is standalone, not dependent on outside
>libraries except when essential. I would like to discuss the
>possibility of making an exception and adding zlib to a future vtk
I do agree with you, zlib is a good candidate, I've been using it myself as
part of a freeware I've written, and it is very easy to use. The static lib
>* Many of the data and image files in visualization are enormous, yet
> sparse. A standard compression would be extremely helpful, and improve
> the speed of loading over network-mounted disks or the net.
As the vtkdata and vtkbaseline are growing and growing, we could shrink
>* with zlib, it's possible to read and write PNG files, which support
> up-to-16 bit grayscale images, 48 bit truecolor images, color-palette
> images, and alpha transparency. PNG is a very simple format (simpler
> than TIFF), so you don't really need libpng, but you need to have
> zip compression.
Indeed libpng is *very* small and portable too, both projects have the same
But as we already have a TIFF writer, we might be able to use the zlib
compression scheme in TIFF.
>* it's very portable (compiles across more platforms than vtk).
I've tested Solaris, Linux, Windows (Borland and VCC). No problem at all.
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