[MINC-users] Display.globals options was: Re: Visualizing data with high dynamic range

[Robert D. Vincent]

Hi Gabriel,

There's no real documentation on this. There has been some recent work on
improving the Display manual, which I hope to release sometime in the next
few months. I'll make it a point to add documentation of some of the more
"interesting" globals.

    -bert

On Wed, Aug 5, 2015 at 4:42 PM, Gabriel A. Devenyi <gdevenyi at gmail.com>
wrote:

> Bert,
>
> Are there docs somewhere on what we can specify for Display.globals?
>
> --
> Gabriel A. Devenyi B.Eng. Ph.D.
> Research Computing Associate
> Computational Brain Anatomy Laboratory
> Cerebral Imaging Center
> Douglas Mental Health University Institute
> McGill University
> t: 514.761.6131x4781
> e: gdevenyi at gmail.com
>
> On Wed, Aug 5, 2015 at 10:45 AM, Robert D. Vincent <
> robert.d.vincent at mcgill.ca> wrote:
>
> > Hi Andrew,
> >
> > Display should be able to handle high dynamic range data. There is a
> global
> > variable "Convert_volumes_to_byte" which is true by default, but which
> can
> > be overridden either on the command line or the Display.globals
> > initialization file. You can set it either by specifying:
> >
> > Display -global Convert_volumes_to_byte false <input.mnc>
> >
> > or by adding the line:
> >
> > Convert_volumes_to_byte=False;
> >
> > to a file named Display.globals in your home directory.
> >
> > Register has similar functionality, but it was added fairly recently, so
> I
> > don't believe it is widely available. The code checked into Github
> supports
> > two globals, Volume_voxel_type and Volume_voxel_signed, that control the
> > conversion of loaded volumes.
> >
> > Hope this helps. I intend to change the default behavior in future
> versions
> > of Display, but I haven't made the change yet.
> >
> >     -bert
> >
> > On Wed, Aug 5, 2015 at 9:41 AM, Andrew Wood <andrew at biospective.com>
> > wrote:
> >
> > > Hi all,
> > >
> > > I'm having trouble visualizing a volume containing float data with a
> high
> > > dynamic range. Both register and Display discretize the signal (down to
> > > byte precision?), which is not workable for these volumes.
> > >
> > > The only solution I have right now is to explode the data into new
> > volumes
> > > by sliding a reduced range over the signal, clamping away data that
> > > register and Display can't handle.
> > >
> > > Does anyone have experience visualizing high dynamic range data? Is
> > there a
> > > tool that can do this, or just a better workaround?
> > >
> > > Thanks,
> > > Andrew
> > > _______________________________________________
> > > MINC-users at bic.mni.mcgill.ca
> > > http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
> > >
> > _______________________________________________
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> >
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