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

[Gabriel A. Devenyi]

Thanks Bert!
On Aug 6, 2015 12:55, "Robert D. Vincent" <robert.d.vincent at mcgill.ca>
wrote:

> 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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> >
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