From: Vasudevan Ramanujam (devvas@yahoo.com)
Date: 08/01/2000 16:20:24
Hi Dave
I would appreciate if you could tell me the exact
procedure for viewing the data set given in the
following location,since my data set too is similar to
the ones that are provided here:
http://asec.cs.gsu.edu/asecdl/materials/vol-viz/volume_visualization_data_sets.htm
This is what I did with the Head data set:
1.imgcopy
"head#raw%size=w,h,z%colormodel=luminance%type=ushort"
output.tif .here it is a 256*256*109 data set
2.voglBasic output.tif
All i get is a hazy picture or no picture.
3.Now if I do imgcopy -tchar then the output tif image
becomes half the original size approximately.Infact
during conversion it gives a warning "data bounds out
of range".Neverthless,voglBasic gives a
"comparatively" better output,but not the best
output,since it reads only half the dataset(8 bits
instead of 16 bits).The idea to convert the datatype
to "char" came to me,since all the example Tif files
are in that format.
Any help will be greatly appreciated!
Thx
Vasu
--- Dave Akers <dla@lobster.engr.sgi.com> wrote:
> Gareth and Vasu,
>
> I've tested Volumizer with unsigned short format
> and I'm finding no
> problems at all. Both imgcopy and voglBasic seem to
> do the right thing for
> my test cases. Can you send me (to dla@sgi.com) an
> example case that
> doesn't work? What specifically do the results look
> like?
>
> Not sure about the imgcopy problems with float
> format, but I'll look
> into it.
>
> Dave
>
> On Tue, 1 Aug 2000, Gareth Morgan wrote:
>
> > Good news:
> > Experimenting myself just now I have got voglBasic
> to work with float data
> > type. Though, as you say,
> > it appears not to work with ushort.
> >
> > Bad news:
> > imgcopy doesn't seem to produce sensible output
> when converting to float
> > (even if you use -m0.0 & -M1.0 flags to set
> min/max values), and produces a
> > garbled version of the image.
> > You may have to write your own conversion program
> to do this.
> >
> > -----Original Message-----
> > From: Vasudevan Ramanujam
> [mailto:devvas@yahoo.com]
> > Sent: 01 August 2000 14:58
> > To: Gareth Morgan
> > Cc: info-volumizer@corp.sgi.com
> > Subject: RE: My Volumetric data
> >
> >
> > Hi
> > I am running my applications on SGI Onyx2 with 64
> MB
> > texture memory.
> > I was able to view my data after converting the
> data
> > type from "ushort" to "char",but the problem is
> that
> > it comes at the expense of volumetric detail.The
> data
> > now is just half the original size.
> > I tried converting the output data type to "long"
> > ,but the Volumizer says it is an unknown data
> > format.Does Volumizer example applications accept
> only
> > "char" data type?
> > Please let me know the other data types supported.
> > Thanks
> > Vasu
> >
> >
> >
> >
> >
> > > Hi all
> > >
> > > Can anybody please help me with my problem?Here
> it
> > > is:
> > >
> > > My Volumetric data(female body anatomy) is
> > > Unsigned
> > > short and it is 128*128*1024*2 bytes =33554432
> big.I
> > > converted it into a Tif file so that Volumizer
> can
> > > accept it,but it is not working.So,i have made a
> > > smaller version of the data set, which is
> > > 64*64*256*2=2097152 bytes long.But still the
> > > Volumizer
> > > example application does not accept it.HOw do i
> code
> > > around it so that i will be able to visualize my
> > > data
> > > set.Any help in this regard is appreciated.
> > > Thx in advance
> > > Vasu
> > >
> > >
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